There would be the issue, however, that Jim Carrey played the part several years ago. I don't quite know how they could ever work around that, unless maybe it somehow were to be established that Eddie Murphy had been some sort of original Riddler, and Carrey was some kind of protege/replacement (which sounds too much like the Batman/Robin thing, anyway.)

But, given that it's only a rumor (and that I'm not a Batman fan), I guess my words are largely irrelevant, lol.