More ICs adorning the back side:

Lattice LP1K Field Programmable Gate Array

+14690B EWXS 9.504 AB Power Management IC; likely Maxim Integrated's MAX14690EWX

Linear Tech LT3009 Linear Regulator (Pebble tells us that the LT3009 is included for supplying power to the upcoming Smartstraps)

Bosch Sensortec BMI160 (6-axis IMU with acceleroemeter and gyroscope)

Freescale Xtrinsic MAG3110 3D Digital Magnetometer

Texas Instruments DRV2603 Motor Driver

The blue arrow points to the smartstrap data in/out pin; above it in red is the power in/out pin and below it is the smartstrap/charging ground pin. The red arrow points to the positive (+) battery connector and next to it in black is the negative (-) connector.