There are several gameplay vids of her, but none of them is specifc to Cassie.

She, Subby and Scorpy didn't even have the official variation renders

Nope. Not even a variation render like others got. We just know the moves in the variations.

Hollywood (Shades): Adds Air Akimbo and Nut Krunch

Brawler (Green glow fists) Adds Power Slam and Air Takedown

Spec Ops (Headset) Adds Missles and Salute move which I don't know if it does anything yet.

And just to add on to this in case you don't know, her universal special moves are:

Single Shot
Glow Kick
Getaway Flip

I forgot all about that!!!

Sub-Zero did have one. Look on their FB page.

Yeah, Subzero had one. But not Scorpion or Cassie. I remember thinking to myself that this must mean these 2 characters' variations weren't set in stone. I really hope that IS the case with scorpion. Like most everyone has stated here in scorpion threads, that minion summoning move would much better suit other characters like QuanChi, Shinnok, or Noob Saibot.

What's the Glow kick? Her own shadow kick?

Yes but she fly kicks up at an angle.

Oh yeah I knew but it slipped my mind, sorry. Cassie, Scorpion, Kung Lao, Ermac, Kitana, Reptile are still missing too