I'm an ALT (Assistant English teacher) over here in Japan and the gaming scene is quite big over here (or at least the impression I get from chatting to students).
However, most tend to play home-grown MMOs and have never heard of the Western ones. Or they play PS3 online stuff. I'll have to find out some of the names of 'em one day...
Not sure about the expat community here. I'm a gamer, but only just got new PC and more into solo games (currently Fallout 3) but maybe will get back to WoW

. The other people I know tend to play console as well, mostly due to the fact that they're only here a short time (1 year-ish often) so buying/building uber-PC doesn't make sense financially.
And for the whole British English Vs American English... the American English is closer to the original (i.e. older) English (e.g. Pants => Pantaloons whereas we Brits use trousers). Obviously those settlers we sent over didn't like change
