The servers will come down for a restart on December 20, at 16:00 GMT/ 11:00 AM EST/ 8:00 AM PST. (check this link to see when this is in your timezone). The downtime is estimated to take 1 hour.
Please note that tracking for the Saga of Blood Leaderboard Competition ends at 10:00 AM EST, an hour before the servers go down!! Any kills after this time will NOT be tallied up to determine the winners for this round. Thank you!