A quick peek under a sneaky EMI shield near the USI Wi-Fi module...

...Reveals a pair of Broadcom BCM5976C1KUB6G Touch Screen Controllers, similar to the BCM5976A0KUB2G found in the trackpads of various MacBooks.

While we're in the thick of chip identification, we want to send a big shoutout of thanks to our friends at Chipworks, who stayed up late tonight to help us pick out all the teeny tiny components.