World of Tanks Publishing Producer, Konstantin “Foton” Soldatov, published the following information on his VK page. If players have:
- Researched the MAUS in the tech tree (either purchased or not), after the tech tree change the new Tier X has to be researched and bought.
- Researched the MAUS , both new heavy tanks VK 100.01 P and Mäuschen will be unlocked.
- VK 45.02 B with experience on it but Maus is not researched, nothing changes. Players will keep the experience and can research the new Tier X. The new MAUS line will be completely locked.
If you are currently grinding the MAUS, try to get it before the update is released so you can have the new line unlocked and you just need to keep grinding experience on the VK 45.02 B to unlock the VK 72.01.
Source: Foton64rus VK Page