It's great to hear you were able to play several games on Xbox One! Any chance you can post a picture of one of the games running on your Xbox One?
For the music, as you said, Edge probably doesn't support OGG Vorbis or something. Hopefully that'll come too.
The layout bug was pretty easy to fix. Iframes somehow don't take the full height like they should. Adding
min-height: 100%; fixed it. This will be in the next release!