Well, that was quite unexpected.
But then, with a slew of announcements of such type in recent memory (Ratchet and Clank, Sly Cooper come to mind), I suppose it's not too much out of the question for there to be a proper theatrically-released Sonic the Hedgehog movie.
Of course, the obvious questions come to mind: What would it look like? Is the story built off the games or the comics, or is its own thing? And most importantly, what opportunities in the StH universe (besides Eggman) would warrant live-action actors? That last one is getting me very confused.
It's all up in the air right now. I do expect a teaser released early next year, though. Then we should see if it at least looks decent.
Anyways, that makes three video-game movies announced. I wouldn't be surprised if they announced a Skylanders movie later this year.