I don't think WWII works, for several reasons. There are problems with the scale of the 3D tactical battle map when you start adding long-range artillery, mechanized units like tanks, and aircraft. The battle areas would have to be huge, unless that stuff is just abstracted or miniaturized, like the way it's done in Company of Heroes. It wouldn't make sense to have a nice 3D naval combat engine like the one they're adding to Empire:TW without something similar for major air battles like the Battle of Britain, Midway, or the strategic bombing campaigns later in the war. It would be tough to extend CA's basic design of strategic map + small tactical battle map area to those scenarios involving air combat.
Another problem with WWII is that it doesn't fit the "lots of factions, and every faction out for itself" model that the previous TW games have been built on. If it followed history at all, you'd have essentially just two factions competing with each other -- the Allies and the Axis. It wouldn't have the feel of a classic, open-ended TW title, unless they have a scenario where every country is fighting every other one for conquest (basically, the same objection I'd have to an American Civil War TW game). If they did do that, then playing as America your first obvious goal would be to invade and conquer Canada, because it's close, resource-rich, and relatively undefended.Then you'd attack Mexico for the oil fields. It might be a fun sandbox game, but you couldn't call it a "WWII" game.
It might also be a little tricky to have important but distasteful (in modern times) options at the end of the tech tree, like fire-bombing of civilian cities and the atomic bomb. Maybe this is why most WWII strategy games focus on more restricted campaigns, like the Battle of the Bulge or D-Day.
So, just my opinion, but I think WWII is a non-starter as a TW title. CA should stick to earlier periods of conflict before big, worldwide strategic alliances developed. And preferably more melee and primitive missle combat instead of gun-based armies, but thats' just my personal bias.
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