Wargaming is testing a new feature so players can rent premium tanks for gold. Please do not pay attention to the rental prices, they are just for testing porpuses. Players will be able to select if they want a 7 or 30 days rental period and every new rental, for the same tank. will be cheaper. There is a minimum rental price so no player can get the tank for free. Players will also be able to buy the tank with a small discount if they rented the tank previously.
Source: WOT Express VK