you may be biting your tongue on that one.
In the comics, Robin knew who batman was (identity) and begged Bruce wayne to train him. In DK, the man that knew who batman was may become Robin in the next film (he was also a red head) by talking to bruce wayne and getting him to train him. That's how it happened according to story.
If the penguin becomes the next villain, I want Steve Carrell. Steve always does goofy movies. But, I can imagine him being a total creepazoid bad guy too. Like when he gets pissed in "the office" only he is twisted. Carell has the penguin lok to him.
Depp would be a great riddler. IMO anyways.