2.7.1, the first 2.7 maintenance release, is almost ready. So far, 66 tickets are fixed in 2.7.1. There are another 50 tickets open against the 2.7.1 milestone, but most of those will be moved to 2.7.2 or 2.8. If there are tickets in that list you would really like to see fixed in 2.7.1, drop a comment.
To automatically upgrade from 2.7 to 2.7.1 Beta 1, change the version in your wp-includes/version.php file from 2.7 to 2.7.1-beta and then visit Tools->Upgrade. Otherwise, download the beta package and install manually.