I'm in Thailand, and it's not listed as one of the supported regions.
Instead of linking my main SE account randomly to one of the available regions in Asia, I made a second SE account and registered it under Australia. I'm using this second account just for playing the beta. I'm waiting for more info about SouthEast Asian countries because I link my main account to anything, so that I won't potentially regret it later if I do something wrong.
Edited, Sep 9th 2010 11:35am by Threx