Rovio has finally announced Angry Birds Trilogy for 3DS, on the way in 2012.

The retail release combines the first three Angry Birds games — Angry Birds, Rio and Seasons — on one cartridge with new StreetPass features. Sadly the gravity-based Angry Birds Space doesn't feature, but three games in one isn't too bad.

We haven't got much in the way of 3DS-specific details at the moment but Rovio promises new content and updated graphics. With the game on the way before Christmas, we won't have to wait too long to learn more.