As far as I know that the agreement was for Hong Kong's way of life to "remain unchanged" for 50 years. So it should have been 2047 when they can start thinking about integrating Hong Kong.
Seeing this is crazy.
As for diversity, it's a unique mix. Notable quantities of French, British, Americans, Indonesians, Filipinos, Thais, Indians, and locals. Indonesians and Filipinos are obviously insanely marginalized, as domestic helpers, but they were cool to hang with on their 1 day off per week.