[RESOLVED 8:53am PDT, 18 June 2013] Rolling restarts for the main Second Life server channel are now complete.
[UPDATED 6:48am PDT, 18 June 2013] Rolling restarts for the main Second Life server channel are in progress.
[Posted 08:55 pm PDT, 17 June 2013] We will be performing rolling restarts for regions on the main Second Life server channel on Tuesday, June 18, beginning at approximately 5:00AM PDT. Please refrain from rezzing no copy objects, making inworld L$ transactions and remember to save all builds.
Source: http://status.secondlifegrid.net