Hutchison Telecommunications' 3 company announced today that they have signed an agreement with Apple to introduce the Apple iPhone in Hong Kong and Macau later this year, but no other information was disclosed.
The announcement is almost identical to the official press releases from several global carriers in recent times, and it is believed to be a unified requirement by Apple. Specific information such as release date and pricing will need to wait for a unified announcement by Apple, and there is likely to be an official announcement from Apple at next month's WWDC conference.
The 3 company was established specifically to operate the 3G network first, so we can almost certainly confirm that they will be introducing the 3G version of the iPhone. As for whether 3 is the exclusive carrier for Hong Kong and Macau, there is currently no news.