I really hope Frost is dlc in MKX. I love her arrogant personality and she makes a great rival for Cassie Cage. Seeing a girl who grew up rich against a girl who grew up poor as well and seeing how both of their personalities clash together would make such a rivalry excellent.

Plus the idea of a female cyromancer is pretty cool, especially if she is Sub Zero's apprentice. I really hope Frost comes back in MKX because she is a pretty awesome character. Not to mention the 3d era characters need more representation as well as Lin Kuei members in MKX. Seeing how her life is right now, I think it would be good if Sub Zero were to discover her and decide to recruit her and be a father figure that she never had.

Also for those who think "we don't need her since we already have Sub Zero", it's been proven by NRS plenty of times that even though two characters can have similar abilities, they can be totally different and unique from each other For example

Cyrax and Sektor
Batman and Batgirl
Green Lantern and Sinestro
Shazam and Black Adam
The Joker and Harley Quinn

you get the point. Plus if Killer Frost can be totally different from Sub Zero then I am sure the same can be for Frost.

Frost has huge potential and I feel like she deserves to make her big return.