Is this an "official" game or is it a combined effort by some fans and manufacturers?
It is not a "game" as in figures, rules etc, but a sourcebook creating a most interesting background as a base for an alternative historical setting and the opportunity to fight an (international as it were, due to the possibility of international brigades) conflict in the pre-WWII period. Great if you like all sorts of interwar stuff combined with early WWII and late WWI. Since the setting is partly imaginary, for me it has the feeling of a Darkest Africa game in 1930's Europe. Figures are already on the way (though many excisting historical ranges can be used), rules are certainly to follow... Furthermore, since armour, infantry etc was in rather limited supply, you don't need huge numbers or large units to field an acceptable force. This is the opposite of a GW game (so to speak) in terms of freedom of choice.
Rudi