I just received an email today with updated release dates for my pre-ordered Wii U games:
You'll notice the date listed for Rayman Legends: December 4th, 2012.
Now, this could easily be a mistake, but it might be true. December 4th is a Tuesday, a common launch day, and from what I've heard about the game, it's the only playable game on the Nintendo Wii U demo stations. Maybe they want to cash in on the holiday sales?
Rayman Legends was initially going to be a launch title, then was confirmed to be merely a launch window title... then it was pushed into 2013. I'm hoping that Ubisoft has changed their minds and are releasing this game sooner rather than later.
[Update 2012.11.7]: The Rayman Legends website now shows that the game will be available for download on the Wii U network on December 4, 2012! It looks like it's happening!
[Update 2012.11.09] I just checked the Rayman Legends site again tonight, and they have removed the text that said "Download Available December 4, 2012 on the WiiU Network" from the site.