Capping months of rumors and speculation, Samsung has announced its Galaxy S III smartphone at an event in London today. Major specs include a 4.8-inch PenTile Super AMOLED display at 720p resolution, 8-megapixel primary and 1.9-megapixel front-facing cameras with 990ms start-up time, 3.3fps burst mode, and best-shot selection (similar to the HTC One series), 16 or 32GB of storage (a 64GB version is coming later) with microSD expansion, Bluetooth 4.0 support, GPS with GLONASS reception, high-throughput 40MHz 802.11n Wi-Fi, NFC, and a relatively large 2,100mAh battery.