While the new update for Xbox One has been available for preview members for a few weeks, Microsoft is now rolling out the March 2016 update to everyone.
The March system update brings the ability to purchase Xbox 360 backward compatible games directly from the Xbox One. After the update becomes available on your console, you will be able to buy compatible Xbox 360 from the Xbox One dashboard.
Microsoft also published an official list of Xbox 360 backward compatible games at Xbox.com.
In addition, the system update for Xbox one enables party chat for up to 16 participants, gamers can include party chat on Twitch broadcasts, and output chats on both headset and speakers at the same time.
Other improvements include better video playback on the console, which allows owners to watch videos directly from the activity feeds.
For those who own an Xbox Elite Wireless Controller, Microsoft is making available a new firmware update to improve thumbstick precision. Furthermore, there is an update for the Xbox Accessories app on Windows 10 that includes more information about your controller, including current firmware version, battery status, and other details.
Source Major Nelson