As now seems to have become traditional we already have a micropatch for the new update. The patch contents havn’t been given.
For RU. May 4 will be a small update, which will correct some technical errors. The servers will be unavailable from 4:00 to 4:35 (MSK). Scheduled server reboots are canceled.

For EU. The World of Tanks servers will be unavailable on 04.05.2018 from 05:30 – 06:10 CEST due to this update.

For NA. Nothing as Yet.