I wonder if (in terms of the park map) they will list Ministry of Magic as being part of "Diagon Alley" or if they will officially designate the section in front of Diagon Alley, "London" on the map and list Ministry of Magic as being an attraction there. It would fit with the other "city named" areas but I'm not sure if Rowling would let a Harry Potter ride be in a section of the park that doesn't have "The Wizarding World of..." in front of it.
To say this, I would imagine that if Fantastic Beasts makes it's way to G3 in some form, it could make sense that the area's get branded to just be "Wizarding World - Hogsmeade", "Wizarding World - London" and "Wizarding World - New Location".