Looking like that one leak might be true since they mentioned in this video a skill tree and gates that take you to more traditional boost stages both of which the leak mentioned.
The leak also mentioned multiple playable characters, which looks like it could be true now especially since we know Amy and Tails are with Sonic at the beginning and the Sonic Central video showed a brief short of Knuckles.
If that's true then there will also be a Chao Garden according to the leak.
Looks great, gotta admit I'm :isaac-pog: when I see :no-copyright: doing them kicks and sending small hadokens out