According to an anonymous tip Kotaku received, a sequel to Rayman Origins may be in the works. The tip included a few screen captions from Arkenford, a marketing survey site which Ubisoft is a regular client of.
The screen captions depict a less outlandish setting in which ghosts, dragons and Greek gods may be a part of. From what can be seen on the screen captions the four player, drop-in/drop-out gameplay of Rayman Origins has been maintained.
Kotaku has contacted Ubisoft about the screen captions, but has yet to receive a response.
In addition to the tip, Kotaku did receive some screen shots as well: