According to FirstShowing.net, a casting sheet reveals that El Riddler will in fact be dropping into Gotham in Batman 3. I expect this wont be a repeat of the Jim Carey pink haired take. This could be a good opportunity to showcase Batman's detectiving skills. If this turns out to be legit, it wont be too surprising. I think Riddler is pretty much the biggest name villain left for Nolan to use that lacks any superpowers. Now, add in the Black Mask or Catwoman and I'm sold (well, actually even with Crazy Quilt I would still be lining up for Batman 3).