Apple is planning to unveil its new iPad Air 3 at an event in March, according to a new report from 9to5Mac. After skipping the release of a new standard-sized Apple model at last fall, the new 9.7-inch iPad Air 3 is expected to replace the year-old iPad Air 2 with an upgraded model — possibly including a rear-facing LED flash, additional speaker grills to match the audio quality of the iPad Pro, and possibly even support for the Apple Pencil. A…