Just received the following email from Apple Asia. This was sent to several of my email addresses I have registered with Apple, including my MobileMe email address. There are no further information as to pricing or whether this pending availability is only through 3 HK, Apple's official carrier partner in Hong Kong.
I am hoping that since the email is from Apple Asia, it will mean that the iPhone 3GS will be available at the same time through Apple Online Store Hong Kong.
There are currently rumors in Hong Kong stating that the Friday launch is exclusive to 3 HK for a fix period; this may be as long as the wait non-3 HK customers (or want to be customers) had to wait for the iPhone 3G last year.