Speaking of the update today I got my Beta Invite for google music on my XOOM. I use a separate google account on my XOOM since my fiance and I share it and it generally sits at home. So far the service is pretty sweet.
Not sure but it sounds like Google is rolling out the invites to anyone with a XOOM I never even signed up for the beta on that account. The account I use on my three Android phones I signed up for but have not gotten the invite.