Right on schedule, Canonical's Steve Langasek has announced the release of Ubuntu 9.10 Alpha 4. This fourth development release of the Karmic Koala brings more updated packages (including a kernel based upon Linux 2.6.31-rc5), Ubuntu One file sharing support, and some other new features. Ubuntu 9.10 Alpha 4 is also the first build to have Kubuntu Netbook Remix support for KDE 4.3 and Ubuntu UEC. Ubuntu UEC is for the Ubuntu Enterprise Cloud with support for Amazon's EC2 service.
The release announcement with 9.10 Alpha 4 download links for Ubuntu, Ubuntu Server UEC, Kubuntu, Xubuntu, Ubuntu Studio, and Mythbuntu can be found on ubuntu-devel-announce
. More information surrounding this release is also available from the Ubuntu Testing page
The next release in the Ubuntu 9.10 series is Alpha 5, which is penciled in for a release on the 3rd of September. The final release of Ubuntu 9.10 "Karmic Koala" will come on the 29th of October.