Today, the Xbox app is available with the latest Windows 10 Insider Preview build (build #10080) for phones. Once you’re on the latest Windows 10 Insider Preview build on your phone, go to the Store Beta to download and check out an early preview version of the Xbox app. We’re excited to move toward bringing your favorite Xbox on Windows features to Windows 10 for phones.
To join the Windows 10 Insider program, go here to sign up, then download the Windows Insider app to your Lumia phone, choose either a fast or slow ring and get the updates. For more information, check out Gabe Aul’s post on the Windows Blog.