I like it when publishers dig through last year's offerings. Heck, even two years before that. It would be awesome if they ported Deus Ex, wouldn't it?
They ARE porting Dues Ex.
But, seriously, even though I'm supposed to answer with only one, the answer really is ALL of the upcoming games and games that have been out since Wii U's release. I wish the industry heads would talk more about why they won't port a game to the Wii U (or any console for that matter). It was clear why they wouldn't port them to the Wii, but now it just doesn't make sense from a technical standpoint. It HAS to be money/business related. Are we given an explanation why Tomb Raider, Bioshock, the new Ninja Turtles game, Far Cry 3, Lords of Shadow, and a ton more I know I'm missing? No, we're given BS reasons or no reason at all. Neither the devs nor Nintendo talk about why hardly ever. We're left to guess. At the very least, why don't they just release a digital copy with no advertising and just enough gamepad tweaks to satisfy Wii U owners and call it a day? I'd be happy with that. At least for the first few games of 2013.
I'm calling it right now: GTA V will not be on the Wii U and we will not be given a reason why.
Now, back to the discussion. If I had to pick which ports I'd want on the Wii U out of games this gen that have already been made, then I'd pick every single franchise that got its start on Nintendo, because that's where they belong:
1. Metal Gear
2. Final Fantasy
3. Bionic Commando
4. Double Dragon
5. Castlevania
6. A bunch I know I'm missing.
How bout we start with those.
And then for the new unreleased games or recently released I'd say Bioshock Infinite is the one I'm most interested in playing. It wouldn't have to be a watered down port like it is on the PS360.