We are just a few months into Batman: Arkham Knight and though you may have already completed the game, you haven’t seen everything. Arkhamverse has given us a good look at concept art for the game, which is enough to get all of us drooling for some unannounced skins, as well as some vehicles and skins we’ve already seen.
Take a look.

New 52 Nightwing

New 52 Dick Grayson

Joker Thug

Joker Thug

Joker Thug

Joker Thug

Joker Thug

Joker Thug

Damian Wayne

Batman Zur En Arr

Knight's Fleet

Knight's Fleet

Knight's fleet

Knight's Fleet

Knight's Fleet

Red Hood (Grant Morrisson)

Batman Justice League 3000

Batman Hush

Batman Gotham Knight

Batman Flashpoint

Batman Beyond

90's Catwoman
I like a lot of these, and though I’m not the biggest Batman Beyond fan, that one may take the cake.