Apart from Ubisoft though,who always back Nintendo, the Wii U has no other confirmed 3rd party making a new ip or exclusive for the console. And for a console that is supposed to be focusing on getting 3rd party on board, it doesn't sound like they are doing a great job of it
All of the supposed leaks are usually all bullcrap as well, I don't know why you bother to take notice of them
There haven't been any third party titles announced due to Nintendo's strict NDAs, but there was a great deal of third party support demonstrated at last years E3.
The launch and launch window list from third parties is looking particularly impressive:
Lego City Stories (published by Nintendo but developed by a third party dev)
Assassin's Creed 3
Dragon Quest X
Ninja Gaiden 3: Razor's Edge
Batman Arkham City
Aliens Colonial Marines
Darksiders 2
Ghost Recon Online
Killer Freaks From Outer Space
Untitled Rabbids game
And the following are confirmed on their way:
Metro Last Light
Rayman Legends
Formula 1
Untitled Tekken game
Untitled Battlefield game
And the following are pretty certain imo:
Resident Evil 6
GTA V
CoD BlOps 2
And those were announced before Nintendo went mental with their NDAs. You can probably add another few exclusives there after E3. There's going to be a major information blowout next month. Love them or hate them you have to give Nintendo a great deal of credit for how they've managed to keep the lid on things, it's quite remarkable tbh.