The back of the motherboard hosts a Panasonic pan1316 RF module, promising the Pebble's advertised Bluetooth and Bluetooth Low Energy (BLE) functionality, powered by a Texas Instruments CC2564 Bluetooth Controller.

After some dainty desoldering, the module's EMI shield is removed to surprisingly reveal a slightly different Texas Instruments CC2560A, that appears to not include BLE support.

The Bluetooth antenna printed into the flex circuit board connects to the pan1316 BT module here.

Word on the street was that Pebble had BLE functionality just waiting to be activated with a firmware update, but we can't find evidence of the hardware to back up this hidden potential.