No, that's not fan art. Media Molecule's announced that stickers and costumes for Judge Dredd - and others from the 2000 AD comic universe - will arrive May 28.
Much as I'd like to flesh that out, that is all the information contained in a movie poster Media Molecule put up on its site sometime yesterday. Here's the full size version:
Prepare to be Judged [Media Molecule, thanks Norgrove]