Board Thread:General MK Discussion/@comment-26385611-20150510043733/@comment-4565921-20150510213158

Ridley Prime wrote: Think Kai's just another one of the characters from the earlier games forgotten about or they wanted him to remain forgotten/obscure. MKX would've been the perfect time to bring him back in some way though but instead we got another Shaolin guy, Kung Jin.

Even if they did include Kai in MKX in some way, he may have just gotten the Fujin treatment, in which case, lame sauce. But who knows really. But that didn't stop Hsu Hao from appearing (albeit briefly) in the comics, as well as Jarek and Tasia. So I think Kai can definitely come back in the future.