After playing the demo, I think Sonic game have improved, but I dislike how Sonic have become as slow as other characters. In this game look like Sonic, Tails and Knuckles have became adult.
Adult Sonic: Became as slow as other characters.
Adult Tails: Lost Flying power, gained Floating power.
Adult Knuckles: lost floating and climbing powers, but now he can dig.
I have skipped a few Sonic game, this one look good to me, I'll buy it. I've only played Sonic and Knuckles (one of my first games on PC, the other is megaman x4), Sonic heroes (which is my favorite), and a sonic fighting game on gameboy (can't remember the name, but It's a good game).