Sadly, the question "what is Angry Birds Go?" hasn't been answered yet, but Rovio has at least spoken briefly on the project. What we're not looking at is another, traditional, Angry Birds game, though. Having played around with endless runners, and what looks to be the Red Bull Soap Box race, they've apparently settled on something that "felt right."
So, we're lead to believe we could be looking at some kind of kart racing game, perhaps with an added side of destruction involved. Who actually knows for sure at this point, and the video above just helps us speculate a little more. It's Angry Birds, so people are going to be interested, whatever it might be. What's your guess?
Source: Rovio (YouTube