When Joker says in the trailer "i cant wait to show you my toys" and behind him there's some kind of meat hanging? Well, it look pretty similar to Killer croc's place from the comic book "Joker" (2008). He's a cannibal and he keeps in that place the meat and bodies of his victims. If you look closely, behind Joker you can spot a ribcage or something like that. I think the movie will take inspiration from the comic book. Frost and the color of joker's car are the same.

Damn… I never would have realized that… I was wondering what the deal was with the meat in that part of the trailer and now I’m seriously thinking that ties in with this part from that graphic novel. Thank you for pointing that out :)