Team,

We are releasing a new build to the Alpha ring at 6.00pm PDT today. Our goal is we will release this to the BETA ring tomorrow is all looks good.

Please note the new features and when we are enabling the Light themes!
https://forums.xbox.com/en-us/thread...5-c1a68b0c9b7a

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 9/6/2017 (8:00AM GMT 6/9), you will be prompted to do so at that time.

DETAILS
OS version released: rs3_release_xbox_dev_1710.170831-1900
Available: 6:00PM PDT 9/5 (1:00AM GMT 6/9)

NEW FEATURES:

Light and Dark Themes
  • We are adding new themes to the dashboard. In addition to the current theme, you’ll be able to select a new light theme. Please note that this setting will not be enabled till 9.00am PDT 9/6/17 as we need all Alpha users to be on this new build. After 9.00am on 9/6 simply reboot your console to see the setting. 1. Navigate to Settings > Personalization > System personalization > System theme. 2. Select Light.

Notifications enhancements
  • Game invites are moving from Action Center to the Multiplayer tab of Guide and Recent Achievements will now be in the Achievements tab. This makes it easy to see at a glance if you have new invites or Achievements when opening the Guide, and makes accessing those notifications faster, now that other system notifications aren’t in the way


FIXES:

Movies & TV and Misc Media Apps
  • Black screens during movie playback have been fixed as has Fast Forward.


KNOWN ISSUES:

​ Light Theme
  • There are some known visual contrast issues in messaging, the entertainment twist and the Mixer twist – you may see white one white. Fixes will be coming soon.

Sign-in
  • 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.

Netflix
  • 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.


Source: Xbox One Insiders - September 5th: New Preview Alpha build (1710. 170831-1900) : xboxone