The second alpha of the next Ubuntu release is here.
Read the announcement
Knot-2 is the second in a series of milestone CD images that will be
released throughout the Edgy development cycle, as images that are
known to be reasonably free of showstopper CD-build or installer bugs,
while representing very current snapshots of Edgy. You can download
it here, for Ubuntu, Kubuntu, Edubuntu and Xubuntu respectively: