Sega's put out the fist Sonic Generations 3DS screenshots, but we're afraid they are few.
There are four shots in total of the handheld title that show Green Hill and a boss level.
Generations is coming to consoles as well but the handheld version features exclusive levels, an unlockable Special Stage and the StreetPass options 3DS can provide.
Sega sent over official details for Sonic Generations on the 3DS at the beginning of the month. Go and brush up on them if you've forgotten.
Have a look at the screenshots first though won't you?