Apple announced last night that iPhone 4 would be headed to China on September 25, availability will be via:

Apple Retail Stores including the new Apple Store® Hong Kong Plaza in Shanghai and the new Apple Store Xidan Joy City in Beijing opening on the same day. iPhone 4 will also be available on Saturday at China Unicom retail stores for qualified buyers with a new two year contract.

And pricing:

iPhone 4 will be sold in China through Apple’s retail stores for a suggested retail price of CNY4,999 for the 16GB model and CNY5,999 for 32GB model without a contract. At China Unicom stores, iPhone 4 will be available for qualified buyers with a new two year contract, sold separately. For pricing and tariff information please visit www.10010.com.

Needless to say that's a huge market that, thanks to unlocked (officially and otherwise) iPhones from other countries, already has a huge gray market. It will be interesting to see how an official Chinese version does this time around, especially with the continued lack of a China Mobile model. Any bets?

[Apple PR