The additional boardgame component will include a rulebook, 46 plastic playing pieces, battle arrows, dice and a new multi-part gameboard that measures 55cm by 120cm. That’s quite big!
Battlefront, based in New Zealand, published Flames of War (aka FoW to fans) back in 2002. It’s now a very popular World War 2 minis wargame.
Flames of War uses 1/100 scale minis (that’s 15mm scale) for troops but aircraft tend to appear on a 1/144 scale. The mechanics make use of d6.
There are plenty of other source books; Osfront, Afrika, Eastern Front, Fortress Europe, Monty’s Meatginder and Bloody Omaha to list just a few – so we’ll have to see what Mongoose and Battlefront mean by “first strategic supplement” but it’s bound to be interesting.