As has become the tradition for Microsoft, a public beta will precede the next Xbox Live update. The doors are currently opening for sign-ups, but the process is different this time out.
Instead of signing up online, the beta applications are rolling out on the Xbox 360 dashboard. A tile will appear on your Home tab inviting you to apply. All 41 Xbox Live territories will be able to participate, though Japan’s application process will be happening later.
As of now, comments on Major Nelson’s announcement post indicate that the tile is appearing sporadically around the world. If you don’t see it yet, keep checking. Move fast when it is available though, as spots are limited.
As this is a beta that will be under non-disclosure agreement, no details about the content of the update have been shared.