All right kids, it time to play Spot the Differences! The now-discontinued iPad Mini 3 on the left faces off against the contender, the new Mini 4 (right).

Not only is the battery thinner and of lesser capacity, it's now a single cell, instead of two.

The lower right antenna now lives in the upper right. We'll have to tear into an LTE version to see what that means for that.

The FaceTime camera assembly is seriously slimmed down.

Plastic spacers fill in the gaps in the Wi-Fi logic board on the Mini 4 (perhaps to provide some more support for the display).