There is a lot of preparations for Battlefield 3: Aftermath happening on November 20, as well as other updates to Battlelog. Some of the maintenance and updates we are performing will affect the availability of Battlelog and/or Battlefield 3. See below for the full details. Click links to see corresponding times where you live.

Battlelog maintenance
08:00-09:00 GMT Nov 20
This is a planned update of Battlelog that carries mainly bug fixes, preparations for the imminent release of Battlefield 3: Aftermath, and deploying this month’s Premium Bonus Content drop (more on these later).

Battlefield 3 maintenance on PC
08:00-10:00 GMT Nov 20
During these hours, Battlefield 3 multiplayer will not be available on PC

Battlefield 3 maintenance on Xbox 360
10:00-12:00 GMT Nov 20
During these hours, Battlefield 3 multiplayer will not be available on Xbox 360

Battlefield 3 maintenance on PS3
12:00-14:00 GMT Nov 20
During these hours, Battlefield 3 multiplayer will not be available on PS3


http://battlelog.battlefield.com/bf3/news/view/2832654788338832927/