Ubisoft was working on arguably the most highly anticipated third-party Wii U game when the console launched last holiday shopping season. Rayman Legends was slated for a release in February 2013, and it was just a few weeks from release.
Nintendo Wii U owners were playing a demo of the brilliant looking game, and they had a lot of excitement around what the game was going to bring to the next-generation console.
It was at this point when Ubisoft announced that the game would no longer be a Wii U exclusive, and would be delayed until September 2013.
The game was virtually finished per Ubisoft, and there was no real reason for the delay to happen.
Up until now, we had no idea as to why the game received a delay, and lost the exclusivity tag on the Wii U.
It now appears that the reason for the delay was due to the poor sales of the Wii U.
Ubisoft has confirmed that the system simply did not sell well enough to warrant an exclusive release on the console.
The low sales of the Nintendo Wii U have cost it a lot of third-party games. Electronic Arts has stated that they will not release any games on the console until the installed base picks up.