Some skins will arrive later while others could have just been for trailer purposes. A lot of people began to freak out when they saw the lady with the prosthetic arm so if she ever arrives, I'm sure she'll look much different as well.
November 2018 - last edited November 2018
We can potentially still see her in the future, might be an epic skin we can unlock through the paid currency. As for that "shh" takedown, you can do that in-game if you melee someone who is prone on their back