Opted in
Update on the Xbox Forums on selection/enrollment process:
"The next Xbox One update is nearly here and we're excited to start receiving feedback on it. This release includes substantial under-the-hood changes and some exciting new features. Over the next few weeks we'll be gradually enabling the new update option for the Preview audience.
During the rollout of the New Xbox One Experience last year, there was some confusion surrounding our selection process. This time were making it more simple. The option to enroll a console to test the latest update will be made available to users according to their Preview Award point score at the end of the last Preview wave (the users with the most Preview Award points will be eligible to opt-in first). Once you're eligible (and again, everyone in Preview will ultimately be eligible), you'll receive an Xbox Live message indicating that you now have the option to enroll in the latest Xbox One Experience via the Xbox Preview Dashboard. If you elect to enroll, your console will begin receiving updates shortly thereafter. Note: 'Shortly thereafter' is subjective
. The amount of time between opting in and receiving a build will vary based on issues identified by the Preview audience. Not to worry though, we will add people in the order that they opted in. "
http://forums.xbox.com/xbox_early_a...review_forums/nxoe_1603/f/5601/t/2165359.aspx
So, order of invites are based on your points (activity) in the last preview wave.
You will get the updates pushed to you in the order you opt in (so opt in whenever you get the message
)