Hey, I'm living in Korea now and like the people above stated it is a case by case scenario.

The games I own:

Tekken 6 - English version except for the manual
FIFA 11 - English version except for the manual (the online code doesn't work, though. Thanks again, EA..)
Condemned 2 - English version except for the manual
Super Street Fighter IV - English version except for the manual
Deadly Premonition - Japanese version with manual in Hangul

I hope this helps a little. If there is a certain title you are curious about, drop me a line and I'll see if I can find out.