A Sega Sammy Holdings earnings report may have outed plans to release Sonic Generations on PC and 3DS. Spotted by Andriasang, a section highlighting titles planned for Sega's current fiscal year includes a listing for Sonic Generations on 3DS and PC as well as the already announced releases for Xbox and PS3.[/p]
This makes the rumor started with that Gamestop list more possible. And it's nice to have it on PC too.
And that's what I can quote since I don't know japanese, thus can't read the PDF. But feel free to download it and check it out at the source.
Will update when Joystiq does.
Joystiq
Update: The listing has been removed. Sega made no comments on the matter.