I'm randomly guessing "Rolling" means that they take down 1 server at a time, patch that and leave the others up? Because my bot is still going, at a very good pace, and with an insane luck streak on Sarkoth ;p I got a shutdown message but if it was rolling when I created a new game I would probably have been placed on a different server again that was either not going down at once or had already been patched? No?
UPDATE: My client ran fine through the entire patching process. Rolling downtime = WIN!