Prequel to '89? Well, that's quite dumb! You don't reboot a franchise and base its reputation to a dead one. Sometimes, I really feel that if you want to be hired at Warner you have to have a mental problem.
We agree on the Carrey thing. There's no way for him to appear even as a cameo of a different character. And we also agree on the possibility of Riddler being the main villain in the next film. I'm not saying that Nolan will surprise us by having the Ventriloquist as the main baddie, but I don't like that people still think on terms of the Burton films. "Oh, Nolan did Joker, so the next logical step is the Penguin and Catwoman or the Riddler."
I mean, the guy resurrected the Bat-chise using Scarecrow (a not so common villain even for comic book fans) and Ra's (a villain known onlhy to the comic book readers). And I still feel he should've kept Joker for the 3rd (not that it was bad!). But you know, imagine if he had kept Jo for the peak of the franchise.