Ubuntu Hardy is officially out! Check out the download site to get your copy!
Addendum:
1) Ok, I guess I had the wrong file to blacklist the kvm module for VirtualBox - try specifying it in "/etc/default/linux-restricted-modules-common"
2) To update server installations: "sudo do-release-upgrade"
3) Flash + sound works. What I did was the following:
"sudo apt-get remove flashplugin-nonfree"
"sudo apt-get install flashplugin-nonfree libflashsupport"