Apple has announced that it will launch the iPad Wi-Fi in China this Friday, September 17, at 10:00 a.m. local time. Curiously, Apple’s announcement makes no mention of when or if the iPad with Wi-Fi + 3G might be available despite a recent report that indicated the company had reached an agreement with China Unicom to offer the device. The release also states that Apple plans to roll out the iPad in “many more countries” later this…