JK Shin, President and Head of IT and Mobile Communications for Samsung Electronics, presents the new Samsung Galaxy S 4 during the Samsung Unpacked event at Radio City Music Hall, Thursday, March 14, 2013 in New York. (AP Photo) Samsung’s first iPhone-beating smartphone will be replaced with a model that tracks your eyes and fingertips, lets you control it with the wave of a hand, reports on your exercise, and uses eight computing brains for a speed boost. The South Korean company revealed its highly anticipated Galaxy S IV in one of the world’s biggest phone launches this morning in New York, broadcasting its unveiling to Times Square and hundreds gathered at Radio City Music Hall. More than 300,000 people tuned in to watch the live stream on YouTube. The handset, which looks similar to the Galaxy S III it replaces, also features a larger and significantly crisper 5-inch screen, a slimmer body and a larger battery, and sources say it will be available in Australia by late Apr