In addition, Pikmin 3 will run at 60 frames per second.
The first party Wii U games shown thus far at E3 will run natively at 720p. It is unknown if the games will upscale to 1080p. Speaking to Wii U Daily, a Nintendo representative on the show floor confirmed the native resolution of all games shown so far. The system supports video output at 1080p, but none of the first batch of games coming at launch will be running natively at that resolution.
The representative also made a point to note that Pikmin 3, and possibly other Wii U games, will run at 60 frames per second.