Cool! Yeah, I think in places like the commercial center English would be the de jure language but, maybe there's kind of like an English pidgin, like RoadRash suggested, heavily peppered with words from Khmer and Thai (depending on what part of the city you're in), borrowing a lot of its colloquialisms/grammatical structure, etc. Just a thought! 

Also, started work on my CS, should have it up soon. 

By the way, how far into the future are we?