I have to say I am VERY excited and optimistic about this and I don't get where the negativity is coming from. Whether this ends up sticking to any previous origin story, or a completely original one, it looks like they're really trying to get deep into the woods with this one. From his pathetic life, taking care of his (mentally ill?) mom, to dealing with mental illness himself, to trying to fit in somehow but knowing deep down he just doesn't, to having life kick him when he's down, to finally snapping.
That one trailer told more of a "story" about this character than the entire Nolan movie with Ledger.
Don't get me wrong, I LOVED Ledger's joker and it was creepy as hell when it came out, because it hadn't been done before.
But this one actually disturbed me. AND I LOVED IT!
The shot showing his notepad where he's writing down jokes tells me the direction they're taking with this is so much more involved than anything Ledger did. the child-like handwriting, the innocent cheesy puns that he probably thinks are funny, and the writing devolving into basically becoming a diary where he's venting about having a mental illness where the handwriting gets even more childish. All of that was covered in just a couple of seconds with one single shot.
Phoenix is an infinitely better actor in my opinion than Ledger and I cannot wait to see what he does with this character