Hi
While it might seems a good idea (and don't get me wrong, I would love to see stk on Xbox one) it's not going to happen anytime soon for a few reasons:
1) It requires a bit of manpower to do a good port, we are right now focused on network + polishing older tracks
2) It requires to link stk to proprietary library which isn't compatible with GPL*
3) It also means paying a fee in order to be an official app, and we think our money is better spent to improve the actual game
more information
hereSam