A lot of us old-times are still more comfortable with the manual upgrade, so if the auto-upgrade gives you grief, you always have this option. It’s just a matter of taking backups (both of the database and the files) and then uploading all the new files.
I must say, I’m getting so excited for the merge. 🙂 I’ve also had a quick look at the recent Buddypress trac and some exciting stuff is in there, too. I’ll write it up as soon as I grok it.
As always, if there’s a wordpressmu related technique that you’d like to see a tutorial on, just let me know. I’ll either find it or write it.