Correction: Rayman Legends is still releasing in September in the U.S.
There seems to have been some confusion regarding the North American release date for Rayman Legends. After a press release was sent out today confirming an August 30th launch, Ubisoft has informed us that the anticipated platformer will in fact release in September here in the U.S. The EU version will still be out on August 30, though.
Coinciding with today's announcement was the release of the Wii U exclusive Online Challenges App, a totally free application that contains the Online Challenges Mode of Rayman Legends. In this mode you can compete in updated Daily and Weekly Challenges against friends and players online.
Rayman Legends is available for Xbox 360, PS3, and Wii U.