I posted a note on their facebook page about this. There should be a basic formula for every nationality; units that exist in every set. Various bonus units could be included on a nation by nation basis. For HBG to achieve their goal of replacing the OOB units, each nation needs at a minimum:
Land:
-Infantry
-Artillery
-Tanks
-Self Propelled Artillery
-Mechanized Infantry/Armored Car
Air:
-Fighters
-Bombers
-Dive Bombers OR Torpedo Bombers OR Light Bomber (Sculpt would depend on nation)
-Air Transport
Sea:
-Fleet Carrier
-Light Carrier
-Battleship
-Cruiser
-Destroyer
-Submarine
-Transport
Because of mold sizes, these units would most likely be realized over the course of a few sets, similar to what is being done with the Japanese sets at present. There will be room for extra “bonus” sculpts in the various sets. This is where pocket battleships, light cruisers, jets, paratroopers, tank destroyers, etc. could be fit in. IMO this formula is the most efficient and will yield the best results both economically and from a gaming perspective. It would also provide consistency (which is perhaps the most important factor) throughout the entire range of nations being offered.