I would love to see Hungary and France added in some way to the game. I personally think the Hungarian tree should be included in an Italian/Hungarian/Romanian tree, just like in War Thunder, because the Italians and Hungarians could complement each other: the Italian weapons/vehicles would fill much of the lower ranks, while the Hungarian could fill the higher ranks, because the Kiraly is already in rank 5, the hungarians received some Tigers from the germans, as well as MG42s and Stg44s. The italians also sold some stuff to the hungarians, especially aircraft, they both used some german weapons, especially machineguns and rocket launchers, they both used the Solothurn AT rifles, etc…
For France, I think it is a little bit trickier (of course I might be biased because I am french, lol), but I would like to see an independent french tree, because, we used our own weapons at the beginning of the war, after the fall of France, the FFL were equipped with british weapons, during the landings in Europe, we were mostly equipped with american equipment, but a big part of our forces were still armed with our own equipment, especially our forces that landed in southern France, while some collaborationist forces were equipped with a mix of french and german weapons, and the french forces also used captured tanks in 1944/1945, like Tigers and Panthers. And we must not forget that some units fought in Indochina too, so we could see French vs Japanese on some maps.
But even with only french weapons, there is already more than enough stuff to make a complete tree, the problematic part would be with the vehicles.