first of all, the 9.14 Test Server First Phase is now over, Ph3lan from EU forums, as usual is giving more info than NA's staff:

"The Common Test was switched off at 16.30, the first phase of the test server is over, thank for your participation. There will be a second phase of the test coming in the future..."

Second, there will be a micropatch tomorrow, GhostPrime on the NA forums has said that it will only affect the West NA Server:

"There are plans to release Micropatch 9.13_6 on February 18th, 2016
The maintenance will begin at 3:30am Pacific Time (11:30 UTC) and will last approximately 25 minutes.
During maintenance, the World of Tanks West servers will be unavailable."

I've also noticed that tomorrow, RU servers will receive a maintenance of nearly 2 hours, I browsed around if EU is going to receive a server downtime as well but EU Costumer Service, who has somehow been able to not be completely useless after my rant, haven't said anything but I still don't trust them. I'm poking the EU staff that's still online at this hour and try to get an answer, if you don't hear anything from me it means that is just likely some isolated/geographical maintenances.

...And as I was about to click on "publish" after poking them, a magical announcement appeared:

"Greetings Commanders!
On the 18/02/2016 at 05:30 UTC, the World of Tanks EU1 Cluster will be unavailable for approximately 25 minutes as we perform maintenance work.
Thank you for your understanding and patience.
Roll out!
Your Customer Service Team"

( ͡° ͜ʖ ͡°) There you go...