I don't have a link right now, but I've seen lots of statistics that show much of the remaining IE6 traffic coming from China. Feature phone usage is also most prevalent in developing countries.
I believe that out-of-date software and slow connections are highly correlated. New hardware and fast connections are the most expensive part of computing. Old (or very low cost) hardware doesn't run up-to-date software. So there you have the reason for that correlation.
AFAIK the IE6 traffic from China is caused by modded IE6 versions that are very popular in China and pirated Windows Versions which do not update the browser because Windows Update is not working / disabled.
I have heard this of internet cafes, specifically Central and South America. Fellow web developers have returned to describe Facebook Chat using a Java tool, etc.
I believe that out-of-date software and slow connections are highly correlated. New hardware and fast connections are the most expensive part of computing. Old (or very low cost) hardware doesn't run up-to-date software. So there you have the reason for that correlation.