As I think I remember the devs saying that national variety is quite an important point for the game, I’d predict the following:
Rashid - Saudi Arabia. His desert palace (maybe a beautifully tiled inner courtyard with palms and fountains with Azam watching) Either that, or something super hi tech, like the top of a skyscraper or a super-yacht. They may even place him somewhere like Monaco, alternatively.
AKI - China. Pretty sure she’ll be on the existing China stage, though maybe it’ll be deserted or in a different lighting / colouring.
Ed - Germany. A castle that acts as NeoShadaloo’s HQ. Or a German Bierkeller (remember they’re leaning further into national stereotypes than ever!)
Akuma - Japan. Pretty sure he’ll have Genbu, but reskinned for nighttime.