Rovio today tweeted a teaser image of an upcoming Angry Birds game, which it calls "a big adventure with new birds." Many of the games in Rovio's ultra popular Angry Birds series have utilized the same group of birds introduced in the original game, each of which has its own special ability. While the company has added some new birds and modified existing birds for select games like Angry Birds Star Wars, today's tweet hints at some all new birds for the next Angry Birds game. Aside from revealing new birds, Rovio's teaser is short on information. It is not clear when the company plans to release its newest game, except for a vague "coming soon" announcement.Big adventure with new bird
