For those of you running the Windows 10 Technical Preview, your Xbox app is set to get an update today. There's nothing groundbreaking involved, but the update does bring a feedback button on the top navigation bar, along with some tweaks to the friends list.
Here's a breakdown of the additions, from Microsoft's Larry Hryb (otherwise known as Major Nelson):
Top Navigation Bar. The smiley face can be used to send feedback about the app to the product team, get access to forums for the Xbox app, and you can now rate the Xbox app.
Friends. The user experience for Friends has been updated so that you now see Suggested Friends under a Suggestions header at the top of the Friends list, with a See all button to browse the entire list of VIPs on Xbox and People you May Know. Additionally, you can now start typing in the Friends search box to instantly find specific friends.
Settings. Small fit and finish items were added to the settings page.
Hryb notes that your app should automatically be updated once it rolls out to the store. If you'd like to check the version number to be sure, it should read as 2.2.1502.02017 or higher.
Source: Major Nelson