I don't think this is the actual look of the Joker in the film, it's probably just some marketing thing. The only thing in the photo that is consistent with the leaked set pictures is the green hair.
Pretty sure it is the look they're going with - though I wouldn't be at all surprised if the negative response sees them scrambling to change it to something less lame.
If you play it like Ledger's version you'd just be accused of doing a poor impression of Ledgers Joker which is a problem to start with. So you have to change it into your version of it since it's a different script etc
Well obviously. The joker character is pretty malleable and can stand up to pretty diverse interpretations. Doesn't change the fact that this one looks embarrassingly shit.
The look they're going for could potentially
work (I actually think the grill is a pretty neat spin), but imo it needs rethinking, starting with those laughably bad tattoos. Get a proper tatto artist to design something cool and less contrived, for example.