WiiU will get Angry Birds I am almost certain of it. Nintendo is aggressively pursuing third parties and the biggest ones especially online titles. Nintendo wants to be a serious contender online this generation and they are going in a different direction then MS and Sony Nintendo is going for an open and free online system giving developers control. This will help Nintendo immensely as developers and publishers are always complaining about Sony and Microsoft's restrictions.
But online Nintendo will have as many killer apps as possible. Plants VS Zombies, Cut the Rope, Angry Birds are all very likely to be on Nintendo online store within the launch window. Nintendo is investing a fortune in getting internal downloadable games as well.
Lastly Miyamoto was all about pick up and play. He isn't about epic 2-hour missions and 200+ hour games he's not even as big about games that require an hour at a time. Angry Birds can be picked up for five minutes of game play at a time or as much as a few hours. Something Miyamoto strives for it even features animal characters and a fantasy kingdom another thing Miyamoto loves.
Nintendo wants any of the quality mobile titles it can get on WiiU. We know Nintendo is probably investing in making sure the WiiU versions are also unique maybe built from the ground up. Nintendo knows how important they are. Nintendo's goal is likely to convince parents to buy their children the game on their WiiU instead of lending the child their 500$ I-pad or risking their I-Phone. Its a brilliant move!
"In God We Trust - In Games We Play " - Joel Reimer