This is a sync of the code from WordPress 2.7 released last December. It’s taken a while but I think it’s worth the wait as there are many bugs fixed. Besides the merge with WordPress 2.7 there are also a few new features, including Viper007bond’s admin bar which is the most user visible addition.
Check the timeline for further info.
Upgrading from WordPress MU 2.6.5 should be as easy as copying over your existing install but please backup everything. Blog databases must be upgraded but that will occur in the background as usual.
I would really like to thank everyone who helped me bring this release out and offered me encouragement along the way. I’d name names but I’m bound to miss someone! It’s great hearing what everyone is doing with WordPress MU. There’s quite a community out there!