I really think many games will benefit from the GamePad acting as a 'second screen' device. Games like Zelda have the map displayed at all times, and it's great for quick inventory management.
Ubisoft is a big supporter of Nintendo (which is ironic because they were one of the first publishers to drop support during the GameCube era). I guess they really are platform agnostic these days. Watch_Dogs is looking amazing, it will be a great replacement for the GTA game Nintendo fans will likely never get.
WB Games deserves a shout out as well. I'm a huge fan of the recent Batman Arkham series, so it's good to see those games on the Wii U. And of course those adorable LEGO games will be on everything under the sun.
We also can't forget about Activision. Call of Duty and Skylanders are never going away, and Activision knows those games have fans on Nintendo consoles (Skylanders especially).
As long as these companies (WB, Activision, Ubisoft) keep supporting Nintendo systems I will be fine with the lack of other third-party support. I don't care about Bethesda after paying the boring and tedious Skyrim. And frankly Rockstar is the only one I'll miss.