Oh, there's a list all right...
[spoiler]I can tell you right now, Sonic 3 and Sonic and Knuckles are being treated as one game. From the sound of their choice, they were between Hydrocity and Sky Sanctuary.
Sonic 2's level on consoles is Chemical Plant Zone. There was never any doubt on that one.
There's no Sega Saturn representation at all, nor is there for Game Gear, Master System, Sega CD, and 32X.
Sonic Adventure's level is Speed Highway. A shame because I would have adored either Windy Hill or Lost World.
SA2's was a no brainer.
Heroes is another unfortunate toss up. Sega can't decide between Seaside Hill or Casino Park/Bingo Highway. Given that Casino Night Zone is on the 3DS, Casino Park is all but confirmed.
Sonic 2006 gets some unfortunate remembrance, but they're going with Crisis City. A HUGE shame here as Flame Core, Aquatic Base, and Kingdom Valley were ALL better choices.
Sonic Unleashed is getting Rooftop Run/Spagonia. That one is pretty much confirmed.
Sonic Colors is likely getting Planet Wisp on consoles, with Starlight Carnival or Sweet Mountain on 3DS. It's the only modern Sonic game that is also getting an entry on 3DS. On 3DS, Advance 1, Advance 2, Advance 3, Rush, and Rush Adventure are getting their own representatives instead of console-based levels.[/spoiler]
My apologies if I killed your hype.