Seeed Beaglebone Black rev C1 changes

We just received a beaglebone black from Digikey manufactured by Seeed:

The box is marked as “rev C1”. I’d like to understand what changed between rev C and rev C1. At first, I thought it was the changes captured in the recent commits on: GitHub - beagleboard/beaglebone-black: Design and Document files for the BeagleBone Black from but we’ve noticed some further changes. In particular the top copper seems to deviate from the official BBB rev C3 design at pin 12 on U2.