Savage and Luthor are the obvious returning picks, as noted in several posts already. The Joker is also likely to appear, even if only in the background. Also, given the focus given these last two seasons on Batman's relationship to the League, and especially his little crack about the kryptonite in his utility belt ("Call it insurance."), a Tower of Babel adaptation is probably forthcoming.
This is not a specific guess, but I think the team will spend at least one of the episodes creating an entirely new villain for the League to fight.
"Excuse me, I'm sorry, I thought I just heard a line I wrote."
George S. Kaufman
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