Are you ready for another Angry Birds title? Rovio thinks you are, and it's teasing "Angry Birds, but not as you know it." And we believe it: from the short teaser animation and associated imagery, it appears that this particular game will involve racing of some sort. We haven't been given any details on when to expect it, but Rovio promises more updates over the summer, suggesting either a late summer or early fall launch. Head here to check out the teaser.