Ubisoft will be releasing a challenge mode of sorts, part of what will be the retail package of Rayman Legends, on the eShop in April.
It will feature five different levels, one of which is Wii U exclusive. Each will be playable for up to five people and will feature online in addition to local play.
This content will be free when it hits the eShop in April. Combine this with the possibility of Watch Dogs, Rainbow Six and Splinter Cell on Wii U and I think Ubisoft could get some of those angry Wii U fans back on board.