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Ok, here is your leak:
* Short announcement on May 31st
* Trailer release with some fanciness at the end of E3
* Release in December or later
* Back in Kanto
* You will meet Lillie
* Pikachu and Eevee versions of Pokemon Yellow
* Pokemon GO integrity already was in SM/USUM, Niantic is being lazy
* Alolan Graphics
* Overworld Pokemon are already there in Detective Pikachu ffs
* Pikachu or Eevee following you
* Game is HACK FREE, there's simply no reason to hack it
* Online mode in Battle Agency style
* You just pick a mon and set it up as you wish instead of rental mons
* This is a Reboot, this is what Pokemon Z and Stars has become together
* Zygarde might come back
* Shadow Mewtwo is confirmed from Pokken DX as part of lore
* Openworld, you do challenges in any order you want
* Completing the story is just beginning of the game
And all that has already been confirmed by multiple different sources, you all just can't search shit online.