We had few Asian members in the past, thus few members that offered Asian content. My impression was (is) that NavNGo is not very interested in the Asian market. Better said: I don't know that for sure at all. Point is that I read/hear/see nothing new since the 8.2 Chinese build, published in 2008, when I am correct about the year. And that build was a beta !
Other correction: I don't read or speak Chinese, so it's possible much content (maps, languages, voices, ... ) is available - on Chinese websites - but I simply am not aware of it. Do not forget Android and iPhone iGO/Primo opened new possibilities in Asia.
And lately, we have even fewer Asian Members since the Chinese version of Navitotal started. I imagine that is where all Asians have gone to.
Therefor you maybe better ask there?
[Please Register or Login to download file] . They do have an iGO section and they should know.