The opportunity to sign up for the Xbox Live Update Preview Program is now here, in order to participate you must complete a survey on the Microsoft Connect website. Those who have been selected to participate will be able to preview the upcoming dashboard improvements and Avatar Marketplace early.

The Xbox Live Team will then review all of the applications and if you’re selected you’ll be sent an email notifying you of your acceptance in the program. A couple of points before you head off to register:

We’re looking for multiple thousands of participants, so your chances of making it in are good
This opportunity is open to all Xbox LIVE Members in regions where Xbox LIVE is available.
Just completing the survey does not automatically get you access to the Preview Program. We’ll be making final selections from the completed surveys and send you an email if you are selected.
While both box LIVE Gold and Silver members can sign up, Priority will be given to Gold members in the selection process.

If you are accepted, you’ll hear from the Xbox Live Team in about a week. Make sure your information on Connect is updated so we can email you if you are accepted. Also, I’ll be sure to updated/edit if the program fills up.

Sign up here using this LINK

Source: Major Nelson