I think the Joker needs his trademark Smile,it also depends on his acting.When i first saw Heath Ledger as the Joker in a picture i didnt like him and thought he's spoiled the Joker but after watching the way he portryed him i think he done a good job and pulled it off. Now were see if Jared Leto can do the same ;)
official JOKER picture released from upcoming movie : suicide squad

I dont know,i dont even know if Batman is in it.Its called the suicide squad or something.
yeah it is suicide squad

Mapayt,what are you saying? Are you saying Heath ledger committed suicide? Theres no proof to that.He may well of took his life but we dont know for sure,it was probably an accidental death.Similar to what happened with Jimi Hendrix.By Heath Ledger dying its kinda made it hard for other actors to play the Joker i reckon.I dont know why but i think thats the case.

I was told by a huge fan of Batman (My friend Kevin) that the old actor from the franchise commited suicide. So yeah.
Wait, you may be right. Looks like a drug overdose.
http://www.cinemablend.com/pop/Heath-Ledger-s-Cause-Of-Death-Made-Official-8740.html
This happened to Bobbi Kristina Brown too, didn't it?
the upcoming movie suicide squad has brought many questions about Jared Leto as the new joker, his pic of himself as the joker was released yesterday,and its not what we expected:
Jared leto joker is quite different,with many tattoos and those silver teeth,what do you think ?