It seems that a trailer for Rayman: Legends has leaked and it shows the game playing on the Wii U. Here is the video from Gonintendo.com
Have to say, I am a little intrigued by the last part of that vid. Adding other characters to the game is a pretty nifty idea. E3 can't come fast enough.
Part of me thinks the last part you're talking about is going to be another one of those Skylanders setups where you can only use items with an RFID chip for the game...
Although the one player controlling the enviroment part interested me... If you thought people could do epic trolling in New Super Mario Bros Wii, this'll likely have some evil people wringing their hands gleefully. XD