See that up there? That could be your next iPhone -- or it could be a tear-shaped dream. It's a mock-up of what is said to be the iPhone 5, according to anonymous sources quoted by Joshua Topolsky. A continuation of the concepts laid out in our post-CES look at what's next for Apple, the design here is said to be thin, metal-backed, tapered, and sporting a 3.7-inch display with the same 960 x 640 resolution in the iPhone 4's retina display -- resulting in a slight drop from that phone's vaunted 326ppi density. The home button is quite