Source: Engadget Tim Cook just pulled the covers off of the hotly-anticipated iPhone 4S here in Cupertino. On the outside the 4S looks exactly like its predecessor, but on the inside it's "all new." Apple has jammed a dual-core A5 CPU inside alongside a new dual-core GPU that supposedly boosts graphics performance by up to 7x. Up front is the same Retina display we've all come to know and love, and a glass back. That antenna around the sides (which [...]