A drawing representing the alleged iPad Air 3 shows a number of rumored features for the device, along with a slight size increase. The drawing, published by Engadget, shows a Smart Connector and four speakers, in addition to a rear camera flash. If the drawing is correct, the new iPad Air 3 will be 0.1 mm wider and 0.05 mm thicker than iPad Air 2 — a thicker screen could portend Apple Pencil support. Another recent report featuring an alleged case…