Leaving aside the flying ponies and the Star Wars-inspired robots, April 1st was used by Gaijin to test various mechanics and game modes disguised as pranks. For example, the ships that were tested in 2016 opened the way for today's naval battles. The submarines that were tested in 2018 are not in the game yet, but we will probably get them by the end of the year. However, today Gaijin turned War Thunder into Space Thunder and the name should say it all, right?
While adding space battles in the game does not seem like a great idea right now, this special event might be used to test directional thrust mechanics that could be added to some modern jets sooner or later. No matter the purpose, the special event is fast-paced, quite entertaining, and bound to give you headaches sooner or later. There are four combat space suits to use, each with its strong and weak areas — assault, scout, close quarters, and support.
While the new battle mode will be available until April 6th, War Thunder now also includes a special event that will run until the 13th and can add to the player's portfolio the rank VI Object 279 heavy tank and a few other goodies. For more details about the Space Race event, you should check out this page. Before my screenshots and the official Space Thunder trailer, here's my quick tip: even if you are not interested in gaining the Object 279 or any of the other premium vehicles available (most likely due to time constraints, since it might take a bunch of long hours to complete all the required tasks), feel free to use the in-game market to sell the materials obtained and gain some useful credits that could be used to acquire camos, premium vehicles, and so on.