re: WW2-based RPG's?

Valkyria Chronicles is fantastic but it's not really a WWII game. Its story is set in a fictitious country pulled into a war that shares similarities with WWII. However, the story also has some sci-fi / fantasy elements like impossible super weapons and people with special (magical) abilities.

Gameplay-wise, it's really unlike anything I've ever experienced. It's a tactical, turn-based RPG like Fire Emblem but when you move a unit the game temporarily turns real-time and you control that soldier from a 3rd person point of view until they've used up all of their action meter.

Having said that, you mentioned you'd even take a game from Square. This is probably not far off from what a WWII game would look like if they ever developed one. It was made by the same team who made the JRPG "Skies of Arcadia."