On September 6, Microsoft released an update for Xbox One Preview Program users, which included Clubs, Looking for Group (LFG), as well as some other features. While the company said that the features would be coming to the Xbox beta apps in a few weeks, the update is available now, just 11 days later.
Here is the full changelog:
Clubs – Clubs are gamer-created and managed groups that can help you meet people and grow communities of gamers who love the same things you do.
Looking for Group (LFG) - Need to find players to help unlock an Achievement, complete a weekly quest, or build a team? Xbox Looking for Group allows you to post a “want ad” that other players can see and answer.
The one feature that was announced at E3 but was not included in today's update - nor was it included in last week's Preview update - is Arena. Microsoft says that it will have more news on that soon.
If you were hoping to see the new features in the iOS Xbox app, you're probably going to have to wait until it's ready for the public. As Major Nelson says:
Microsoft told us that the update will be ready in time for the holidays; however, the version number of the Xbox One Preview is 1610, which would imply that it will be released in October, 2016.