According to a recent post on Germany's USK board, Rayman is coming to DSiWare.

It's uncertain right now if the title is a port of an older Rayman game, a Raving Rabbids title, or perhaps a brand new addition to the Rayman series.

There is little known outside the rating itself, however there is one concrete detail known about the game: it's listed as a "Jump n' Run" title, perhaps indicating it's a platformer.

Currently there is no official word from Ubisoft on the title.