Source:http://ftr.wot-news.com/2014/11/07/on-td-viewrange-nerf/
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Hello everyone,
大家嚎， 

just a quick post explaining something. Many of you were shocked yesterday by the upcoming tier 9 and 10 tank destroyer viewrange, which is:
我解释点东西。昨天许多人都被9.5那两个高级TD的视野吓到了，分别是： 

FV4004: 320米
FV4005: 330米

While current viewrange tier 10 tank destroyers is (examples):
而现有的其他的10级TD的视野是（举个栗子）： 

268工程: 400米
263工程: 410米
WT E-100: 420米

etc. (basically between 400-420 meters). So why introduce vehicles, that have such a low viewrange suddenly? Well, the answer is (unfortunately/fortunately) simple. I asked around and there is a massive viewrange nerf coming (likely in 9.5, the nerf was announced earlier by Storm). It will definitely concern tank destroyers (they will have viewrange nerfed to the FV4004/4005 levels) and it’s possible it will concern other vehicles to certain extent. Details are unfortunately not known yet, it’s not even in testing yet.
这样（大概都在400~420之间）。所以为什么要突然加入两个视野这么烂的车呢？答案（不幸的是/幸好）很简单。我四处问了下，很快视野这个指标会被大砍（很有可能就是9.5，Storm早些时候有说过关于这个削弱）。这个削弱一定会把TD砍掉（视野会被砍到FV4004/4005这个级别）而且一定程度上和其他车辆也有关系。现在还不知道具体的细节，因为还没有进行测试。 

The goal of this nerf is to improve the role of light tanks and scouting in the game.
这次动手的目的是增强轻坦的角色定位以及游戏中的侦查的作用。