OpenSolaris 2009.06 to OpenSolaris preview 2010.02 (build 124)
Create a new Boot Environment:
pfexec beadm create devel
Mount the new Boot Environment:
pfexec mkdir /mnt/devel
pfexec beadm mount devel /mnt/devel
Use the dev publisher:
pfexec pkg -R /mnt/devel set-publisher -O http://pkg.opensolaris.org/dev opensolaris.org
Update to the latest bits:
pfexec pkg -R /mnt/devel image-update -v
If everything went fine (after you read the Release Notes), activate the new BE:
pfexec beadm activate devel
Reboot:
pfexec shutdown -y -g1 -i6
Did this remotely. After reboot, system was up and running, including all xVM domU autostarted.