Removing some Pentalobe screws allows us to get a peek at this MacBook's internals.

The silicon buried underneath the trackpad doesn't appear to be any different from last year's MacBook. We find a handful of ICs:

Broadcom BCM5976 touchscreen controller

STMicroelectronics STM32F103 32-Bit ARM Cortex-M3 microcontroller

Monolithic Power Systems MP24830 white LED backlight driver and an International Rectifier IRFH3702 single N-channel HEXFET power MOSFET (likely for driving keyboard backlight LEDs)

Texas Instruments TMP421 temperature sensor and Bosch Sensortec BMA282 accelerometer

Macronix MX25L2006E 2 MB Serial NOR Flash

Maxim Integrated MAX11290 24-bit delta-sigma analog-to-digital converter (likely)