Seems like they're feeling the April Fools spirit over at Gaijin! Earlier today they released the "Flying is Magic" update for War Thunder Mobile, which adds (among other things!) a variety of pegasus units into the game. Apparently this isn't the first time ponies have found their way into War Thunder, so it's nice to see them make a comeback.

If you're curious, check out the announcement video and read through the update post on the War Thunder Mobile website for more details!