Source:http://ftr.wot-news.com/2014/12/17/straight-outta-supertest-hightier-team-battles/
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Source: FTA VK community
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Hello everyone,
大家嚎， 

Wargaming is apparently testing a new tier 10 mode on supertest, that resembles team battles, only with tier 10 vehicles and tier 8 lights. This mode has attack/defense mode. Currently nothing else is known, it could be some sort of preliminary test/experiment and there’s no guarantee this mode will appear in the game (although earlier, it was said by WG developers that Wargaming is working on something like that for high tiers).
WG开始在超测服上测试一个新的10级车模式了，这个模式和现在的7/54很像，但是只能进10级车和8级轻坦。这个模式是有攻防战的。现在没有更多的消息，这有可能只是个初步的测试/实验，而且现在没有保证说这个模式一定会出现在游戏中（尽管早些时候WG的开发团队有说过WG在搞一个高阶用的7/54模式）