Excitement is building for the March 7 announcement of the iPad 3. Of course, we don't know that it will be called "iPad 3." iMore has posted an excellent preview of the event, summarizing all the rumored features of this new device. Everything points to a high-resolution retina display, improved camera, faster processor, and high-speed LTE data. Their article even includes a summary of the expected features of iOS 5.1, which will be running on the device.