Yeah, I definitely think the Black Cats will need to be antagonists/allies, depending on how the campaign plays out. I was also thinking of having various supernatural groups trying to seize control in the States while the Council (and the world) are pretty focused on Europe. I hadn't thought about the rise in sexualized media and the White Court, but I really like that idea.
I think I'm going to have Kemmler be the power behind Hitler, so Nazi Necromancers are a definite possibility for my poor players. XD
I'm happy to compare notes. My game is still in an early planning stage, but my next step is going to be doing some research on locations and NPCs that were present during the '40s.
I recall a section where Harry is talking about the Undercity and the Manhattan Project in the books, but not the exact information therein. I was thinking of having the Pure Mortals be chased out, after encroaching on the territory of the nasty creatures living under Chicago. Any thoughts?