^^^i can't believe this is what is on our minds, but i think they should have an explained absence. and, since we don't know how TDK ends, maybe they might alter the ending so it isn't left unresolved.
RIP Heath Ledger
RIP Heath Ledger
Joker shouldn't disappear, give him a mad Harley and he's on the ride
All I speculate is Nolan will definitely not recast the Joker.
Nolan won't be recasting the Joker.
Chris Nolan's respect for Ledger is proof enough.