don't forget hunnid p said hes working on some music for SEGA
so one of the games could be a modern day Knuckles Chaotix as envisioned by iizuka-san, full of rap music.
Iizuka actually said in an interview in 2010 that he would like to make a Knuckles Chaotix style game, and NiGHTS 3, but SEGA wouldn't greenlight it for him. Of course things could be different now
oh and barry, you don't have to worry about the next game being exclusive to wii u, Iizuka-san has said in interviews he wants Sonic to be played by everyone and is always looking for ways to expand the franchise to get new audiences interested. Plus tbh, I don't think SEGA Sammy would like that, they like their $$$$$$$.
Actually there is another interview with iizuka (lol, lots of interviews with this guy, loves to speak his mind) Where he says Generations and Colors started development at the same time. If you add that up with his Nintendo power interview where he said Generations Wii was scrapped because it wasn't HD, it starts to make sense that Colors is the Nintendo fan version of Generations, even shares same enemy models.
Then SEGA just felt like cashing in on Nintendo fans and had dimps shit out Generations 3DS. Also from the same Iizuka interview, Iizuka said at E3, that only one level for Generations 3DS was playable, and that the HD game was finished by then and was being polished. Further adding to the evidence that Generations 3DS was crapped out by Dimps in a few months to cash in on Nintendo fanbase XD
OH! and from that same interview, iizuka said Sonic Generations White version (HD) was for people who liked High quality games and were already Sonic fans. and that Generations blue version (3DS) was for people new to Sonic with easier gameplay.