Here are a bunch of screenshots for Sonic Generations. Don't get too excited -- they're for the "City Escape" level which we already knew about. In fact, some of these screens aren't new at all (they're in the preview I just linked, actually), so I don't know why they were sent out.
Naturally, I am too lazy to sort out the new screens from the old ones, so I've just posted them in their entirety for completions sake. Also, because I am a shoddy journalist.
I'll get paid for this, too. Haha, game journalism.