Official announcement from WG:
Dear Commanders,
The World of Tanks servers will be unavailable on 10/11/2016 from 05:00 to 05:45 CEST due to this update.
Thank you for your understanding and patience.
Roll out!
Your Customer Service Team
Really helpful, yeah… -_-
Sources tell that the patch introduced a buff for the AMX M4 mle. 49.
