Wargaming prepared something very special that hasn't to my knowledge been done before. As you already know, Czechoslovak tree is coming and Wargaming is looking for faces for Czechoslovak crews. They opened a contest where (Czech and Slovak) players can upload their real life photos. Some of the winners will become the faces of the Czechoslovak crews (30 men, 10 women so yes, there will be woman crewmembers).
Players fitting the criteria can submit their photographs to this thread.
Apart from the fact you can consider this an official EU confirmation of the Czechoslovak tree, I think it's really a great idea to have players participate in such contests.
This is an example of how the photos should look like:
Unfortunately the contest is for Czechs and Slovaks only but maybe there will be some for other nations in the future.