On Wednesday, Apple introduced the world to the iPad 2. A beautiful device, to be sure. Feature packed? You bet. Soon to be selling like hotcakes? Absolutely. But the introduction of an iteration on an already existing product wasn't the most notable piece of the event, nor was the surprise appearance of Steve Jobs. No, Wednesday's event was significant because it introduced the world to Apple's real vision for the foreseeable future, a theme the company has hinted at but never fully expressed. This week, Apple showed everyone where it was headed, challenged competitors on that direction, and made it cl