so I've just installed an app called CC Player Pro on my laptop (wanted to try it cause it is currently free as a part of MyAppFree deal), my xboxone was on at the time and I got a popup saying the app is ready... the app won't run (it is getting stuck on loading screen), but clearly MS is working on bringing UWP apps to the new environment. I'll try to take some screenshots later.
(update 1) works with: cc player pro, perfect movies, perfect tube (make sure the app is UWP)
(update 2) ok, so here is how I did it: 1. prerequisites - xbox one running on a latest preview build, windows 10 machine (probably requires to be in the insider program as well, I have build 14352.rs1), both logged in with same live account; 2. open the store on your windows 10 machine; 3. search for any of the following: cc player pro, perfect movies, perfect tube (or other UWP apps, some install ok, some don't) and install it; 4. watch the magic happens on your xbox one :-)
(update 3) no, my console is not set as "dev kit"
(update 4) well, my laptop got upgraded to newer build 14361.rs1 and looks like this "feature" is now disabled, I'm gonna keep trying though ;-)