I'd like a Sonic Heroes 2, but maybe with the option to chose your own team. You'd still have to have Fly, Speed and Power members, but you'd be able to choose which ones you want.
Sonic Chronicles 2? Sounds nice. Chronicles was fun, but Bioware is too busy to help SEGA with a sequel.
Shadow the Hedgehog 2 isn't gonna happen for a while. I'd like another game starring Shadow as well, but given the bad ratings and reviews the first one got, I don't think a sequel will happen until people forget about the first game, if at all.
Remake of '06... '06 wasn't as bad as people say it was, but yeah, a remake would be nice if they spent more time on it and actually fixed all the screw-ups. Check this:
http://www.youtube.com/watch?v=6X4k4h0Hbns See? That video points out all the screw-ups in the storyline. If SEGA fixed that, the crappy camera angles, and the control scheme, I might play. As of now the only reason I have the game is so I can be Silver. If I want to be Sonic, I put in SADX. If I want to play as Shadow I'll play SA2B.
As for Sonic tv shows, I want something like Sonic X but different. Same art style and stuff, but it would take place on Sonic's home planet. That's what I want.
A SatAM continuation? Sorry dude. The closest you're ever gonna get is to go read the Sonic comics from Archie.
What I've been waiting for is Sonic Adventure 3. Done properly, with adventure fields and everything.