Source:http://ritastatusreport.blogspot.nl/2015/05/hdsd-client-split-confirmed-officially.html
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Hello warriors,
大家嚎，

Wargaming officially confirmed the HD/SD client split. During the installation, you will be able to select whether you want a HD client with HD textures or a SD client with lower resolution textures. Only 64bit OS users will be able to install the HD version.
WG官方肯定了高清/标清客户端分离的这件事。在客户端的安装过程中玩家可以选择究竟是要高清客户端还是要个贴图分辨率比较低的标清客户端。只有64位系统的玩家才可以装高清客户端。

You will also be able to either “upgrade” your client to HD from SD (by downloading additional textures) or “downgrade” your HD client to SD (by having the game delete the HD textures you no longer need).
玩家还可以把客户端从标清“升级”成高清（下载额外的贴图）或者是从高清客户端“降级”到标清客户端（让游戏自己删掉那些用不到的贴图）

A bunch of replies to commonly asked questions:
还有对于常见问题的一些回答：

– Mods should work with both versions the same (WG however does not as usual guarantee their functionality);
Mod应该在两个版本上都是可用的（和以往一样，WG不保证Mod能够正常运作）

– You will not have to choose the version of client every patch, the system will automatically download the SD/HD patch based on your settings;
玩家不需要在每次更新时候都手动选择要使用的客户端版本，系统会根据玩家的设置自动下载高清/标清补丁

– The SD client is roughly 6GB smaller than the HD one (unpacked installation), you will download roughly 3GB less if selecting the SD client;
标清客户端比高清客户端小大约6GB（安装之后的大小），如果选择要下载标清客户端的话就会大概少下载3GB的内容

– The HD client is currently called “beta HD client” because WG is constantly adding new HD content and its size (composition) is not final.
高清客户端现在叫做“Beta高清客户端”的原因是WG还是不停的加入高清化的内容，所以它的大小（内容）也不是最终版