Man o Man, I hve beating this drumm so long I nead a new skin.
Abridged rant:
We have enough US stuff, do the math let the others catch up, unless were are talking sea planes/flying boats then add a Coranado.
Germany has a ton of stuff as well, but neads a late war buff He 177, and some weapons ordance loadout options for the Fw 190's and JU 88, mabby a Me 410.
Brition is well represented, curentaly, that is to say it has a nice ballence of ftr and atack and bomber's modeled curentaly, might be nice to see a British sherman added.
Or a buff varient of the Mossie.
Japan, their is a ton of planes that could be added that would compeat nicely in the MA.
The Peggy is coming, hopefully we will get a Japanese carier cpaable atack/torpedo plane,Jill, or Grace(Grace would be best imo),their are so many great ftr's to add, Jack, Frank,Tojo,Randy,Ki 100, Rex...
Italy, How about a Cant Z. 1007, Re 2000 series anything, G 55, SM 82, P 108, Italy neads a care package asap

Russia,Rumor has it a TU 2 is in the works,and hopefully this will come true

A Russian tank would be nice as well.