If they're gonna use the same boss fights from earlier games, it doesn't even make sense in the story of the game.
Robotnik: "I'mma defeat you with this very same machine I tried to defeat you with before, but failed miserably with."
Sonic: "Riiight."
Heard some people who have played the alpha game not liking it too much, saying it was basically Sonic Advanced. I haven't played Sonic Advance, so I dunno what they mean by that, but hell, I'll buy it anyway. Apparently it won't change much from what they've played either, because Sega have already sent the game away to be rated etc, which means they can't change it too much.