I just got word that the first beta release of WordPress 2.7 is now available to the public. You can download your copy here (WordPress 2.7 Beta 1). Ultimately, it is not recommended that you use this version on a production website but rather, install it on a sub-domain or on a local server.
By the way, the public release of WordPress 2.7 will not be available on November 10th as originally scheduled. Instead, considering this design has a lot of visual design elements as well as features, it needs a lengthier testing period. Thus, November 10th will be aimed as the date that a Release Candidate will be made available. It looks like it could be the end of November before we actually see WordPress 2.7 available to the public. Of course, this all depends on how the testing period goes.
If you happen to install the beta version on your site, come back and let us know what you think of the new version.