Because I'm bored, I present:
The Big Wii U Multiplatform List
I've said before that Wii U, based on the apparent November timeframe of its launch, should be getting not just extremely late ports, but a version of every HD multiplatform title scheduled for Q4 of this year or later. It's evident that that's not actually going to happen, but the percentage of such titles that are/aren't confirmed for Wii U as of E3 will be fairly telling as to how third-party support is turning out.
With that in mind, here's a list of where things currently stand. I'll plan on updating this on June 5 and doing a numerical breakdown based on the full Wii U software list provided by Nintendo to press. Titles in bold are confirmed; titles that have been unambiguously denied are struck out.
Resident Evil 6 (sorta-denied, but wording left a bit of wiggle room)
Epic Mickey 2 (denied by Spector, albeit with implausible excuse)
NBA 2K13
007 Legends (unofficially confirmed by Shiggy)
Skylanders Giants
Bioshock Infinite (very unlikely, based on Ken Levine's comments last summer)
MoH: Warfighter
Assassin's Creed III
Aliens: Colonial Marines
CoD: BOII (very strongly implied in Treyarch interview)
Tekken Tag Tournament 2 (very unlikely due to redundancy, unless this has merged with Tekken Wii Successor)
Crysis 3 (denied by Crytek)
Tomb Raider (denied by Core)
XCOM: The FPS One
South Park: The Game
Metro: Last Light
Rainbow Six: Patriots
Rayman Legends
Hitman Absolution
Overstrike
DmC: Devil May Cry
Lost Planet 3
Sonic & All-Stars Racing Transformed (strongly hinted at in multiple Sumo interviews)
Pro Evolution Soccer 2013
Metal Gear Rising (very unlikely, due to KojiPro's apparent exclusive-only stance on Wii U)
Project Ogre (very unlikely based on Kojima comments, but seemingly far enough off that there's a slim chance he'd change his mind on porting)
Grand Theft Auto V
Star Trek
Killer is Dead (Grasshopper doesn't have dev kits)
I have a feeling I'm missing a few, though.
Current count: 5 confirmed, 4 denied, 4 unlikely, 2 likely, 14 uncertain, 29 total.