AirPort card functions are consolidated onto the main board—for some unknown reason, Apple ditched the modularity from the 5K model. But we did pick up this funky new retaining clip for the coax cables.
The power supply connects to the logic board by way of not one, not two, but four shiny terminals secured with Torx screws.
It also makes accessing logic board components (apart from the RAM of course) much, much easier. With the power supply tucked back into the rear shell, we can remove the board right away. Let's do that!