My DLC wishlist.

MK:
- Kung Lao
- Mileena
- Johnny Cage
- Reptile
- Jade
- Smoke

DC:
- Doomsday
- Harley Quinn
- Poison Ivy
- Black Canary
- Huntress
- Nightwing


Arenas:
- The Living Forest
- The Portal merged with MK or DC's Earth. Start off fighting on a high ledge, get knocked off, freefall while getting sucked through the portal, and end up in another arena either in MK or DC's world.

Others: Extra Story mode chapters showing interactions and mash ups of the extra characters. Downloadable costumes, and more unique get up animations. Fatalities for Shao Khan and Darkseid. Hidden characters you can fight like Goro, Noob, Quan Chi, etc.

I'd love to see the Pit 2 come back.

I don't see them able to bring back the impaled spikes from the Pit 1, but a sanitized Pit 2 would work, where the opponent just falls far and hits the ground flat.

The Dead Pool would be cool as well, but I think that might be a little to close to a play on words, especially with Deathstroke (props to anyone who gets that one).

Reptile
Mileena
Johnny Cage
Cyrax
Quan Chi
Ermac
Kung Lao
Doomsday
Two Face
Robin
Green Arrow
Beast Boy
alternate costumes
more arenas
and maybe a mini game

Johnny Cage (still do not understand why he miss the cut... anyway...)
Smoke !!!!
Reptile ! ;)