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 announcements about milestone and release availability will be made on firstname.lastname@example.org: 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
Cloud Archive Source Packages
The cloud-archive repository is actually just a backport of an associated Ubuntu release, so the primary source is actually in Ubuntu. The source package branches are all owned by the ubuntu-server-dev team - for example if you wanted to checkout the Nova package for Juno, which was released alongside Ubuntu 14.10:
bzr branch lp:~ubuntu-server-dev/nova/juno nova-juno
or for kilo:
bzr branch lp:~ubuntu-server-dev/nova/kilo nova-kilo
you can then build a source package by using:
bzr bd -S
(that's part of the bzr-builddeb plugin).
These branches are where the Ubuntu Server team drives all of its packaging efforts from including our branch package builds - so you may find some unreleased changes from time-to-time.
Hopefully that gives you a good pointer - there are more details at https://wiki.ubuntu.com/ServerTeam/OpenStack - if you have a change that is useful, please just proposed your changes back against those branches:
bzr push lp:~mylpid/nova/my-great-update bzr lp-propose
This will generate a merge proposal on launchpad that the team will review.