Out comes this ticker’s brain, the all-new—or maybe not?—S5 system-in-package.

Although it benefits from a new compass and double the onboard storage—32 GB, up from 16—most of the integrated circuits remain entombed under a solid layer of resin, out of our reach. Of the few chips above the surface, here's what we can make out:

Skyworks 229-15 465371 1918 MX, most likely front-end module

16 CJ

YY NCJ 7NE (likely the acceleration + gyro sensor)

API 924 920

Looking at the attached display flex cables and laying them over those of the Series 4 for comparison, we can see that the plug in the middle gained 4 pins and the one on the bottom gained 2. Without knowing their function, this closes the door on interchangeability.