This portion of the case seems to be geologically interesting; under the headphone jack crust, we find a reflective backing covering an LED board.

But wait—those LEDs point up at the display, not toward the indicator bar in the case. That seems weird.

The shiny foil layer actually traps the light from the board and bounces it back down to a light guide that shines out through the case.

The final stratum is an array of four noise-canceling microphones.

Who knows if doubling the microphones will actually double the performance from the standard dual-microphone array.