OpenStack packages for Ubuntu are published in Ubuntu main repository and maintained by Ubuntu core developers.
See Installing Ubuntu Cloud for official Ubuntu documentation on how to install OpenStack from packages.
Canonical’s Ubuntu Cloud archive allows users the ability to install newer releases of OpenStack on Ubuntu Server 12.04 LTS (and the dependencies) as they become available up through the next Ubuntu LTS release (presumably 14.04).
See https://wiki.ubuntu.com/ServerTeam/CloudArchive for more details.
Report any bugs that you find in packages from the Cloud Archive to https://bugs.launchpad.net/cloud-archive/+filebug
In terms of communication around the Cloud Archive, general annoucements about milestone and release avaliability will be made on email@example.com: https://lists.ubuntu.com/mailman/listinfo/ubuntu-cloud-announce
Canonical has also set-up a new mailing list which will be higher volume, per upload notifications as new and updated packages land in the Cloud Archive: https://lists.ubuntu.com/mailman/listinfo/cloud-archive-changes
Packaging branches are maintained in bzr under Launchpad. Click on "Code" on the above pages.
Packaging bugs are tracked using Launchpad. Click on "Bugs" on the above pages.
Various PPAs with bleeding edge packages are maintained by the OpenStack Ubuntu Testers team. See PPAs for details. The Jenkins server can be found at https://jenkins.qa.ubuntu.com/view/Openstack_Testing