[Resolved 12:05 PM PST, 20 February 2013] Today’s rolling restarts have been completed.
[Update 6:56 AM PST, 20 February 2013] Rolling restarts for the main Second Life server are in progress.
[Posted 10:11 PM PST, 18 February 2013] We will be performing rolling restarts for regions on the main Second Life server channel on Wednesday, February 20, beginning at approximately 5:00AM PST. Please refrain from rezzing no copy objects, making inworld L$ transactions and remember to save all builds.
Source: http://status.secondlifegrid.net