In this pack, you'll find retro Cyber Sub-Zero and Klassic Sub-Zero (Mortal Kombat 3). You can check out the trailer here or below.
The Klassic Sub-Zero skin was leaked a bit ago and is a warm welcome, but a lot of people seem upset with Retro Cyber Sub-Zero. Everyone's been screaming for Cyber Smoke, however when you think about it, they'd have to create completely new move animations for the character instead of just a skin; he'd really be a new character.
Sektor and Cyrax had different animations and the like but they were developed for the retail game, so it makes sense that we didn't see Cyber Smoke offered as a simple skin. Since Cyber Sub-Zero happened in this time line instead, it's a nice nod for them to include him with the retro skin.
I am surprised we didn't see Klassic Mileena (Mortal Kombat II), but really, who can complain with free add-ons.