Users at Kotaku managed to grab some screen captures of an Arkenford marketing survey, which clearly shows a sequel to last year's most overlooked gem, Rayman Origins.
While it's quite possible the game may never see release, the survey does show pictures of various levels, and directly calls it an "upcoming sequel", leading me to believe that it's been in development for some time.
The game would feature the same drop in/drop out four-player multiplayer, platforming, and 2D graphics as the first game. However, the sequel would have rayman exploring "legendary worlds filled with castles, vampires, ghosts, Greek gods, or dragons…"
The staff here at GameRevolution were absolutely smitten by Rayman Origins, so we'll keep our fingers crossed that this makes it to retail.