According to an Arkenford marketing survey, a sequel to Rayman Origins has been announced. The survey included a slideshow video showing off several screenshots of the game in development (one of which is seen above). The game uses the same sort of high resolution hand drawn visuals as the first Rayman Origins. It is said to have a single player campaign and will again support up to four player drop-in/out multiplayer just like the original. This new Rayman game contains different level types than the original Origins. Levels take designs based on mythical elements such as Greek myths, castles, vampires, ghosts, dragons, etc.
I hesitate to even refer to this as a rumor, this seems like a pretty solid bit of confirmation. Screens were released showing off some impressive and professional looking art akin to that of the first game. It won't come as any surprise if this sequel is formally unveiled at the upcoming E3 in June or even before. Please check the link below for a couple more screenshots of the game. They are a little blurry due to coming from a video stream. This is all we know at this time, no announced platforms or release date obviously (though it's safe to assume the 360 and PS3 at least will get it).