Hong Kong is the second country in Asia after Korea is also getting the Android 4.0.3 Ice Cream Sandwich for Samsung Galaxy S2 GT-I9100. The first Chinese firmware build number is I9100ZSLPE recently leaks and probably will be officially released this coming few days over, China, Hong Kong and Taiwan. The rest of Asia like Thailand, India, Malaysia, Indonesia, Singapore, Philippines and Vietnam, no signs of ICS 4.0.3 updates yet.
Stock ROM Dwonload: GT-I9100_TGY_I9100ZSLPE_I9100ZSLPE
Pre-Upgrade: How to Flash or Install I9100ZSLPE.
The firmware comes in a single tar file. Just load it in the PDA button of Odin.
Update: South East Asia, is now also getting the official ICS 4 I9100DXLP2.