Alright here's some information, not all of it though because there really is a lot. The follow up to Sonic Frontiers will finally ditch the boost system to something more like Adventure and the 2D games. Momentum and rolling physics, etc. Expect the spindash to return. Kishimoto has always been a fan of the Sonic Adventure and Classic games but Sonic Team has been pressured to keep using the boost by SEGA corp. Sonic Team is finally getting more levarage to do what they want. Open world will stay but platforming sections will be better integrated into the actual world itself.

There's way more to this but that's the basic gist of what's going on, there's also more misc. information about internal discussions within SEGA and Frontiers development information, etc. Just thought I'd geat ahead of the curve and post some things here so that when the rest comes out you know it's real. Just remember you heard it here first.