If you do want to put total faith in this, here is a breakdown of who is listed here. Also there is an explanation on where Kratos is as this is shown to be from the PS3 build of the game. Look under the image for the list.

Scorpion • Liu Kang • Kung Lao • Sub-Zero
Sindel • Ermac • Reptile • Kitana
Johnny Cage • Jade • Mileena • Nightwolf
Cyrax • Noob Saibot • Smoke • Sektor
Sonya • Jax • Kano • Stryker
Shang Tsung • Baraka • Kabal • Raiden
Extras/DLC¹ • Sheeva • Quan Chi • Extras/DLC^1
1 "Cyber Sub-Zero" and Kratos seem to be in the Extras/DLC slot.

Now the funny thing about all of this is that while this is floating around, Netherrealm's Hans Lo is off talking about CONFIRMED DLC for shortly after launch. Those characters being Kenshi and Scarlet. Both of which are fully fleshed out characters and not just skins slapped on. This is interesting and awesome news as Scarlet was, like many other staple characters, a glitch that just turned the female ninjas blood red. Glad to see that NetherRealm is not going to be pumping out just skins but full characters.

Speaking of ninja characters, as a little extra, here is the awesome and most recent game play clip for Mortal Kombat. It showcases how a tag mach pitting Scorpion, Sub Zero, Sektor and Cyrax might play out. Not to mention the fun family film of Ninja Mime. Now that should be DLC too.