Starting today, Arena on Xbox Live, an online tournaments platform, launches to Preview on Xbox One with the pilot title, Killer Instinct! During Preview, gamers can look forward to competing in daily Killer Instinct tournaments across Xbox One and the Xbox app (beta) on Windows 10 PC. For the initial roll out, Arena will only be accessible to Preview members through practice tournaments on Xbox One in the U.S., with plans to add additional features and expand to the broader Preview audience later in October. Here are more details about the tournament process:
 

• Preview members will be able to register for a tournament 24 hours before it starts on Xbox One. They’ll be able to register for tournaments through the Tournament tab on the Killer Instinct Game Hub.
• Weekday tournaments (Monday-Friday) will be single-elimination format made up of 64 competitors and begin at 7 p.m. PT
• Weekend tournaments will be single-elimination format made up of 128 competitors and begin at 12 p.m. PT and 7 p.m. PT

Here are the other feature updates coming with this update:
* Achievement Rarity:  Achievement Rarity, a top fan request on Xbox Feedback, launched to Preview a few weeks ago. Now, you’ll be able to discover just how unique an Achievement is among players of a given game and celebrate the Achievement itself with a special notification and diamond icon highlighting it.
* Group Messaging on Xbox Live: Recently, Microsoft launched Group Messaging on Xbox One and the Xbox app (beta) on Windows 10 PC. Group Messaging helps you coordinate and keep in touch with your friends and fellow gamers by sending a single group message to everyone in the group. You can also add people to the group and dynamically change the conversation topic. Group Messaging will soon work across the Xbox app (beta) on iOS and Android devices.