WG is going to introduce single premium account system for our PC trilogy, which will create a brand new ecosystem.
With the introduction of single premium account, players will get access to all premium features in all three games, regardless of where it was purchased. E.g., if you buy premium account for World of Tanks, it will be active for both World of Warplanes, and World of Warships.
Regarding World of Warplanes, single premium account will appear during open beta (soon!). Open beta testers, who are active, will be daily given special tokens, that can be used to purchase premium account. Upon release tokens will be replaced by in-game gold.