The team over at Battlelog have announced that they are going to be deploying a patch update to Battlefield 4 Battlelog update this Tuesday November 11th 01.00 PDT / 09.00 UTC, in other words tomorrow! You will not be able to join any servers during this time.
Battlelog will be taken down for maintenance for 1 hour and you will not be able to join any play sessions during this time period. Patch notes will be posted following the completion of this update.
PC: Multiplayer and Battlelog will be offline for 1 hour starting 01.00 PDT / 09.00 UTC.
Console platforms: Not affected!