Found two new 'games' in the Store section of the Xbox One beta app on Windows Phone.. no idea if they appear on other platforms.
update: doesn't appear on the Windows 10 pc app.
Description says Publisher: Flight01
Genre: (2)Music / (3)Shooter
They do download to the console, but just appear to be text/html files.
(2) downloads to Apps.
(3) downloads to Games.
There also seems to be an embedded youtube video 'a quick look at Outlook for iOS and Android' but I can't play it.
No real use in downloading this, probably just some test-stuff ready for the anniversary update.. the music thing is prob related to background music... unless of course it's some secret place holder for some secret free game!!
* should also note I'm on the xbox Insider/preview program or whatever it's called