Here it is, the newest alpha version of Ubercart 3! The biggest news in this release is that the checkout and order forms now take advantage of the Form API's AJAX framework. This allows those forms to become much more stable and much easier for contributed modules to alter them cleanly. So, if you've had to do any of that, be sure to take a look and see how those forms are built now.
If you're looking for Rules integration, I'm afraid it's still not in. Progress has been made in that direction, so continue to keep an eye on http://drupal.org/node/736770. I'll be updating the patch there once I'm done here. I fully expect that patch to land in time for the next Alpha release.