Bit of an old topic,
I just got an Xbox One with Plex to replace a PS3 and a separate Kodi device.
Since there is a Plex binding now, it should be possible to start a scene when you are playing something with Plex.
But there are more media apps on the Xbox One, like Netflix and I would also like OpenHAB to know if I'm playing a game. So yes, an OpenHAB app on the Xbox One would be nice.
The smartglass apps have access to this data, but the API isn't open / documented as far as I know.
As a Microsoft developer I will have a look a the new Windows 10 Univeral apps, which should be able to run on an Xbox One. But I have no clue in how to get the app on the Xbox / in the store and what data is available from the Xbox API.
If I manage to get anything usefull I'll put it on Github.
Greetings,
Leon