Holy holes, Batman! What's this? Wi-Fi-only Minis of yesteryear featured a blank expanse at the end of the logic board—just a flat space where the cellular chips would be in a CDMA/GSM version. This Retina Mini's board has a nifty cutout instead.

Hopefully, this is a cool weight-saving maneuver by Apple, because the alternatives are scary.

Also making an appearance, the USI 339S0213 Wi-Fi Module, as seen in the iPad Air.