It's been a long time coming, but we just bumped pacman 3 into the testing repository where it will live for a few days before moving to current. PLEASE let us know if you find any problems with it by posting a detailed bug report to Flyspray or sending us an email on the pacman-dev mailing list.
The pacman website should be updated in the near future with details on what has changed. That can be found at http://www.archlinux.org/pacman/.