Nintendo uploaded this image to their press site today, which pretty much kills any rumors that they may change the name of the console before release. The file name even has 2012 inside of it.
Update: It’s been taken off Nintendo’s press site. Someone let the cat out of the bag too soon I suppose. I think this is 99.99% confirmation that the Wii U name sticks, or else they wouldn’t have included 2012 in the file name. Nintendo wants to save the full Wii U re-reveal, console name and all, for E3.