When we can use Unreal 4 to build windows store app?

Its already v4.10 and I am desperately waiting for unreal start to support to build windows store package. Dose anyone know when its going to happen?

Thank you for your answer. My point is after windows 10 Microsoft announce its gonna be their last OS and they are building one OS for all platform i.e PC, mobile, X-Box. I might be wrong but I was thinking if we are able to build a game for store it will be for device and we had big market size of windows OS user. So I just wand to know in which version unreal planning to add build feature for windows store.

My guess is not for a little while. I have seen some threads on the forum that indicate the same.