from our hosting provider - Maintenance Start: 6/2/2013 00:00:00 EST Maintenance End: 6/2/2013 04:00:00 EST Service Affecting: No Downtime Duration: Possible minimal packet loss So, should things be a little off during those 4 hours later, don't worry about it, it's the maintenance upgrade they're doing.
If you experience difficulties during the upgrade, just be aware that it's happening, and try again later.