A Niantic está já a remover jogadores que se atrevem a leakar informações, mas conseguimos saber algumas coisas:

– Os objetos no jogo dividem-se em 7 categorias: Pokébolas, Poções, Revives, Mapas, Objetos de Combate, Comida e Camera.

– Na beta só existem os seguintes objetos: Poké Ball, Great Ball, Ultra Ball, Master Ball, Potion, Super Potion, Hyper Potion, Max Potion, Max Revive, X Attack, X Defense, X Miracle (sendo este um novo objeto), Razz Berry, Bluk Berry, Nanab Berry, Wepear Berry, Pinap Berry e Special Camera.

– Pokémon terão naturezas, mas serão diferentes da série principal. A lista de naturezas é: Stoic (Estóico), Assassin (Assassino), Guardian (Guardião), Raider (Assaltante), Protector, Sentry (Sentinela) e Champion (Campeão).

– Dentro do jogo poderemos fazer compras com dinheiro real, como packs de objetos e pedras preciosas (desconhecendo para que elas servem).

– Tal como nos jogos principais, existe o ciclo de dia e noite.

– O jogo terá diferentes ranks que dependem do nível em que se está: no nível 5 é Novato (Novice), no nível 10 é Treinador (Trainer), no nível 25 é Líder (Leader) e no nível 50 é Professor.

– Parece que haverá Pokémon Shiny no jogo, com a mesma probabilidade de 1 em 8.192.

– Como nos jogos principais, haverá três classes de Pokémon: Normais, Lendários e Míticos.

– Até ao momento não há indicação de que existam Mega evoluções, pelo menos no beta.

– As três equipas às quais os jogadores se podem unir são a Equipa Vermelha, Equipa Azul e Equipa Amarela.

– Na beta só estão presentes Pokémon da Geração I.

– Parece que os Pokémon só terão os seguintes atributos: Ataque do Pokémon, Defesa Base, Defesa Individual e Defesa do Pokémon.

– Existem 137 ataques programados no jogo, e outros 95 que são versões ‘rápidas’ de alguns dos 137 anteriores, desconhece-se como funcionarão estes ataques rápidos.

– Parece que a versão final dará ao jogador um Pokémon inicial, coisa que não acontece na beta.

– Não existirão batalhas contra os pokémon selvagens, apenas os apanhas com pokébolas.

– Uma nova funcionalidade chamada Starburst foi descoberta - ainda não se sabe ao certo o que faz.

– Referências ao Google Cardboard, um periférico de realidade virtual móvel, foram descobertas nos dados do jogo.

– Supostamente, cada Pokémon só poderá efetuar 2 golpes durante Gym Battles (?).

– Pokémon que usam Evolution Stones para evoluir precisam de batalhar Pokémon selvagens para ganhar Evolution Shards. Quando tiveres shards suficientes, podes formar uma stone.

– O nível máximo de treinador é 50. A nível 50 poderás ter até 500 Pokémon e 1000 items.

– Cada Pokémon tem um valor de CP (?)

– Recebes pontos nos ginásios.

– Cada ginásio Pokémon vai ter um nível de "prestigio".


Fiquem ainda com alguns screenshots.










Mais informações (para já sem tradução devido á imensa quantidade de texto):

How Gyms Work 

When a trainer gains a high enough Trainer level (by gaining XP from actions in the game) they will be asked to join either Team Red, Team Blue, or Team Yellow's gym. You will then gain a 'Gym Membership.' You may even be able to see a list of other Gym members at the Gym. Your Trainer profile will be public-facing. With a Gym Membership, all "friendly" Gyms become open to you for training, and non-team gyms become "enemy" Gyms where you battle. When you approach a "friendly" Gym, you can either deploy a Pokemon or train one. Your Pokemon must be at full health to be deployed. It is unclear how long training will take, but there is a 'Training Meter'. You get Experience and 'GP' (Gym Points) for training. (Unsure if GP are actually used, or an artifact of past versions. They seems to come into play where 'Forts' are mentioned in regards to leaving a 'Guard Pokemon'.) You can recall Pokemon from deployment.

Gyms have 'levels' and gain "prestige" as they gain levels. As Gyms gain prestige, they move up "tiers" which allows them to have more 'slots' for Pokemon on their team-to-beat.

Gyms appear to have a "Leader" who sets the order of Pokemon who will be battled in the Gym. (They may even have a crown, denoting they are the Leader.)  

How Battles Work 

When approaching a Gym, you can select a team of Pokemon and Battle the Gym Leader. Once you've selected your team to attack with, you can possibly also outfit them with items to "optimize" them for the attack. Battles can optionally take place in AR mode. Once you begin, the camera swoops down and you begin combat.
Battles are time-based and performed in rounds. You can run out of time. Pokemon have two stats at play: Health (HP), and Energy (stamina). It appears that you may fight with one of your selected Pokemon at a time and only focus on one enemy Pokemon at a time. Once you defeat the first, you 'advance' to the next Pokemon.
In combat, you have multiple options: you can choose to Dodge the enemy attack, use an item (like a revive or a potion), or launch an Attack of your own. You appear to have some control over these by using your finger and a crosshair. Dodging and attacking cost Energy (stamina). It appears that you 'charge' an Attack with your crosshairs and finger. Once a Pokemon has attacked, it has a period where it needs to re-target.
Each Pokemon appears to have a signature move that you can 'charge' and a quick attack. There are only mention of 232 moves total in the game. It appears some moves are upgraded or replaced at different trainer levels. You can switch which Pokemon you will attack with. There DOES appear to be official Pokemon 'types' in combat. You may receive a time bonus for having allies with you.
You can surrender or run out of time. You will be declared victorious if you defeat all the Gym Leader's Pokemon.
At the end of battle, the number of Pokemon you've defeated affects the 'Prestige' (level) of the Gym as well as netting you XP as a trainer.
If you are the defending Gym Leader, it appears you can specify the number of charge attacks and quick attacks to perform, as well as which Pokemon to target from the attacking team.
Players appear to have a 'Rank' with Gym badges, unrelated to game accomplishments like 'km walked.'
There are also several things hinted at that imply type advantages and other multipliers can influence battle. These include:
Stamina Bonus, Base Stamina, Base Attack, Base Defense, Effectiveness, Individual Stamina, Individual Attack, Individual Defense, Type Effectiveness, Multiplier, Move Power
Pokemon Moves have several attributes of interest:
Has Type
Has Power
Has Heal
Has Accuracy Chance
Critical Chance
Has Stamina Loss
Has Trainer Level Min
Has Trainer Level Max
It is unclear if all or any or none of these attributes are at play in the current Gym battle system, but they certainly hint a deeper gameplay mechanic than simple Ingress bursters where you press 'fire.' 

Catching Pokemon 

Only Gen. 1 Pokemon are included thus far. Each has 1 or 2 signature moves. Pokemon seem to have been classified into categories: Normal, Legendary, Mythic, and given natures: Stoic, Assassin, Guardian, Raider, Protector, Sentry, and Champion.
You can still expect to enter AR mode if you wish. Balls operate as expected, with higher probability of catching with better balls. It may even be that the crosshairs you aim with are physically larger.
One interesting revelation is that Berries may be used. Our theory is they cause status changes to the wild Pokemon. Encountered pokemon can also 'Attack' - which we guess is a way to sap the player's energy so that they eventually have to flee the encounter if they don't pull it off.
There is no evidence of using a Pokemon to 'attack back.'
You can also throw with a 'spin throw' - which seems to have some effect on probability of successful capture. Finally, you seem to be able to get a bonus for the 'First Catch of the Day' each day.
You can flee an encounter. 

Poke Stops 

Poke Stops operate largely as expected, too. They are aware of the time of day, which bodes well for a lot of things. PokeStops dispense: Items, XP, Eggs, and Gems. They also seem to have a Cooldown period, as expected.
Items and IAP
Items are broken into 'tiers' and are acquired at PokeStops or purchased with Gems. You can find Gems at Poke Stops, or purchase them. The main Item Types are simply:
PokeBalls, Potions, Revives, Battles, Food (causes 'growth'), and 'Cameras'.
Item drops are influenced by trainer level and item-specific drop frequencies. Some PokeBalls or items seem to better for 'night' mode, while others are 'heavy' or allow 'multi-throw' or other interesting options. 

Pokedex 

The following are the interesting data for each Pokedex entry:
Number Seen
Number Captured
Has Captured
Has Encountered
Has Evolution Stone Pieces
Has Evolution Stones
There also appears to be descriptions and all the normal (weight, height, etc). Each individual Pokemon, on the other hand, has the following interesting attributes:
Cp
Move1
Move2
DeployedFortId
OwnerName
IsEgg
EggKmWalkedTarget
EggKmWalkedStart
Origin
HeightM
WeightKg
IndividualAttack
IndividualDefense
IndividualStamina
It is encouraging that this is tracked on the individual Pokemon level! We'll have to wait and see just how personal our relationship with each Pokemon really is.
You are also able to 'Release' Pokemon. 

Eggs 

The 'Egg Bag' shows capacity for 500 eggs with a progress bar of how many km has been walked for each egg.
Trading
Very little is revealed about trading. It seems likely that trading will be limited to a radius from your location or a Gym location. There is a Search (likely within a radius) for names of eligible traders. You may then make or receive requests, and the game will poll for responses until you receive an offer or decline. If there is agreement, you can each select your Pokemon and the trade will be accepted. There is mention of 'Connection Lost' during a trade. We don't know more than this.