Well, according to this tweet from Emile Gauthier over at Ubisoft Quebec,
Ubisoft Quebec is working on a NEW AAA MMORPG Game and we need people to fill these very strategic positionshttp://lnkd.in/hPMFDf
Which leads us to a facebook page where they’re hiring for the Wii U and MMO (but none of the 10 jobs has both in the title) This strongly suggests that an MMO is in the works for the Wii U. Eeeenteresting, no?