Apple tonight confirmed plans to launch the iPhone 4 in China and added the surprise of two new Chinese stores. The device will go on sale in the country on September 25 at 8AM local time. Official Apple stores will sell contract-free 16GB and 32GB models for 4,999 Renminbi ($743) and 5,999 Renminbi ($892); China Unicom will have it available on a two-year contract with prices to be revealed later.