According to WoT Epxress, Public Test #1 for patch 1.14 is coming tomorrow evening. It will include:
The Czech heavy tank branch. 5 new tanks will be tested, the 4 tech tree tanks and one T8 premium tank. Apparently the alpha damage of the T8 premium stays the same (460/shot).
12 premium tanks are getting a buff, these are:
M46 Patton KR,
IS-6 / IS-6 CHR,
T34 / T34 B,
AMX Chasseur de chars,
WZ-111 / WZ-111 Alpine Tiger.
And other stuff:
Ruinberg is getting a rework
The T-34 L-11 (T4 gift tank, anniversary)
Next and final iteration of this year of Battle Pass
Ranked battles for the 2021/2022, whatever this means
Referral program, probably new tanks will be added
Some new 2D and 3D skins.