Source: http://world-of-ru.livejournal.com/3277726.html

Hello everyone,

on the WoT Supertest, a new function apparently appeared – a launcher window, giving you the choice of either downloading HD content, or not.

It says “World of Tank HD Client version – we are pleased to announce that now there is a HD client available, that includes high quality vehicle models, new textures of game objects and other elements, reworked in high detail, significantly increasing the display quality. Installing the HD client can take significant amount of time and requires you to download further XX Gigabytes”

In the client the number is 52,45 Gb, but that’s just some arbitrary test number. The part below the buttons says that one installed, it’s possible to switch between HD and standard client at any time.