Two operators in Malaysia have put up pages for the iPhone 4 . Operator DiGi has put up a Registration of interest page and Maxis too
This is what a document on the Maxis website says
Maxis will be launching the iPhone 4 within the coming months and price announcements will be made nearer to the launch date. However, you may register an interest for the iPhone 4 with us. We will then keep you informed with the latest updates on the iPhone 4.
If you looking to buy an iPhone 4 in Asia through unofficial routes , you could wait for a while for the rates to drop as the iPhone 4 is expected to hit more countries this month end.