Apple today officially announced the iPhone 3G S, the sequel to the iPhone 3G, with a June 19 initial release date. The added “S” stands for “speed,” a reference to the device’s faster processing and potential data transfer speeds. Available in four models—16GB white or black ($199 each), and 32GB white or black ($299 each)—the iPhone 3G S preserves much of the look and feel of the iPhone 3G, adding the following…