At least I'm guessing that's what's happened.
WOW launcher runs, I log in, the patch download screen comes up (the one with the Moonwell backdrop), the patch gets to 100%, I press the "Restart" button and it closes down. Looks like the updater exe does not run?
I've read the posts about people who can't log in, or get DC'd while playing since 2.05, but I'm not getting to apply the patch.
I hope this doesn't happen to anyone else, or to my other WOW installation.