Movie plot is Bird’s Island, where the flightless birds of the game (and now film) call home. It's a bit of a paradise. The birds know nothing of the outside world, and all the birds are generally carefree and easy-going.
All except for a few, that is Red (the bird anybody who has ever played the game will instantly recognize) is the main character of the film and voiced by Jason Sudeikis. Red has anger issues and has to go to anger management classes. When the pigs arrive (the island's first visitors from the outside world), the majority of the birds seem to hit it off with them.
But Red doesn't trust them. He thinks the green pigs (voiced by Bill Hader and other various comedians) have hidden motives.
Some big name voice actors have been landed to voice the birds and pigs in the animated movie. Voice actors include Jason Sudeikis, Josh Gad, Maya Rudolph, Kate McKinnon, tony Hale, Keegan-Michael Key, Bill Hader, and Peter Dinklage.
The movie actually looks like it will be worth seeing, the trailer is pretty good and you can check it out below.