As I play plenty of WoT, I can say this "overview" is quite biased. No, plenty Soviet tanks are not OP, French tanks UP? Sure. French have some of the best tanks. Like foch 155(which WG plans to nerf), Batchat, 50 100, 13 90, two last mentioned used very often in ESL...
Most OP tanks imho are obj 268 and T57 heavy,
Average battle time on server between all tank levels is 6 minutes.
7vs7 mode is already released and there are lot of problems with it, for example the tank level is analysed client-side, which causes cheating.
"The clan leaders can split this money up to the ones that contributes." Only in the most honest clans, mostly clan leaders divide the gold among themselves.