For fans of 2000AD and the Judge Dredd movie (no not the Sylvester Stallone version) you could be in luck, as Mr Dredd himself (Karl Urban) openly spoke about the possibility of a sequel / prequel at Chicago Comic-Con.
"Why yes, there is a definite possibility. But, it is more likely that we will do the origins story with Dredd trekking through the cursed earth to find the first Chief Judge Fargo."
Anything that Urban says on this subject I would not take lightly. He is a big fan of the character, he aided in the creative input of the last movie and has also expressed a huge desire to return to the role.
Although Dredd did not do well on theatrical release. It found new life when it was released to DVD and Blu-Ray accumulating a huge following. When news broke that there wasn't going to be a sequel, the fans cried out, movie forums were a buzz with anger and passion. 2000AD even released a petition to get a sequel off the ground (which I signed). So it seems that the film has the backing from the people, lets hope it gets the backing from the film companies.
Original Film Trailer Below.