There are two Warthunder April fools events this year, they are not that great and were not really worth updating the game for.
Also, on the 8th of April Enlisted is coming out of Closed Beta and into Open Beta. Enlisted is a game by the same company but instead of vehicle warfare it features infantry though you can use vehicles but only in first person I think which I like the idea of. It's going to be section based, soldiers within he section have roles which can be upgraded as can their equipment and in some game modes the whole section is part of the game as AI.
I'm not sure about it, one of the things that worries me is the monetisation and progression system that it will have. It will apparently be tied to a battle pass system which is quite bad for that kind of thing, I guess I will just have to see how tied to that it is. It doesn't seem to have nations in the way that Warthunder does either, rather it has factions in campaigns, so to begin with there is a Moscow and Normandy campaign and they have listed a Tunis and Berlin campaign to come. So how will that work? Is it going to be a whole new tree for each faction in each campaign? That could be a huge pain particularly if that is on top of a battle pass based system of progression.