- Microsoft will have an Xbox app native to Windows 10. The app will do a number of things, including friends list, messaging, activity feed, etc.
- New UI that will allow capturing of gameplay or screenshots from other services like Steam. After recording you can automatically share the clip on Xbox Live. Custom support from games will not be necessary, as this is built in to Windows 10.
- DirectX 12 will offer up to 50% performance increase for games. The devs at Unity have already adopted DirectX 12.
- Fable Legends will release on Windows 10 as well as Xbox One. It will support cross-platform play.
- "[Windows 10] will enable streaming of Xbox One games to any Windows 10 PC or tablet in your home later this year." They streamed a game to Surface Pro 3 and controlled it with an Xbox One controller. Neat.
Those are the main points. The Verge's live blog has a few more details. Head over there to check it out.