I'm sure it's not a fluke. Last night I had my flag up for 3 hours and no party. I searched some of the main sheep areas for lvl 40ish, and didn't find that huge mass like I normally find. We couldn't have lost that many lvl 40 players on our server could we? I do know I've heard many people I partied with say they were going, and after sitting for 3 hours I had to wonder.
Just curious what the figures were for people migrating over. I'm sure SE won't divulge that info.