iPad Air 3 feature wish list: Larger screen
You can never be too rich, or too thin, or have too much screen space.
In fact, there would be plenty of negatives attached to increasing the iPad Air 2's screen size from its current 9.7in diagonal: mainly increasing the bulk of the device (and having to incorporate a bigger and heavier battery to power the screen for as long), thereby reducing its fantastic portability. But a bigger screen would make the iPad Air more adaptable as a work device, and more immersive for entertainment, so who cares about practicalities?
As many tech fans have pointed out, Apple said it wouldn't make a smaller-screen iPad, then it made the iPad mini - so anything is possible. In fact, we think this could happen, but in a separate product: possibly an iPad Pro. We think the main iPad will continue to be based around a 9.7in screen.