HOW TO GET IT
• If your console is in Instant-On mode and you have been selected to receive the update, it will download and install the update and reboot to standby.
• NOTE: Once the update is available to you, you can manually begin the update by launching the Guide and navigating to All Settings > System > Updates.
• If your console hasn’t downloaded and installed the update by 1:00 AM PDT 8/31/2017 (8:00AM GMT 31/8), you will be prompted to do so at that time.
• This update has a shorter than usual amount of time before it becomes mandatory.
OS version released: rs3_release_xbox_dev_1710. 170830-2007
Available: 6:00PM PDT 9/1 (1:00AM GMT 2/9)
• Movies & TV
Fast forward, rewind, and other media controls now function as designed.
• 4K UHD Playback
When playing 4K or UHD content, you will no longer may encounter periodic crashes or black screens. This fix applies to multiple apps which support 4K and UHD content including Movies & TV and VUDU.
When using Arabic or Hebrew language and signing in with a profile using the “Lock it down” security preference, the sign-in screen which requests Microsoft account e-mail address and password is distorted. This does not affect the profile if it is set to use the “Ask for my passkey” or “No barriers” security preferences.
Workaround: Set the console to use another language, sign-in, and set the profile’s security preference to “Ask for my passkey” or “No barriers”. Alternatively, you can still type in your password as normal using the virtual keyboard though the screen is distorted.
When using Hebrew language, Netflix fails to launch.
• Minecraft Better Together Beta
Other games fail to launch after launching the Minecraft Beta.
Workaround: This occurs if the Minecraft Beta is the first game launched after powering on the console; launch another game before Minecraft to avoid this issue. If you are stuck in this state, hard reset your console.
• Blu-Ray Player
3D Blu-Ray content plays in 2D.
• Game Hub
Game Hub isn’t accurately tracking Gamerscore and achievement unlocks for certain games.
Quelle: Xbox Insider Forum