I've just unlocked my Moto G bootloader under Ubuntu Linux using the Motorola fastboot Files found in this thread:
I guess they are useful for all Moto G Linux users :p
There's no need to pait Bluetooth LowEnergy (BLE) devices. Enable on the phone in settings/AndroidWear/BetaHeartReate. Then simply start Ghostracer and watch the heart symbol turning from grey to white when it is connected to your heart rate strap...
After dirty flashing the new update most Google apps seem to be gone. I have to reinstall all of them. I guess this should not happen? I haven't touched gapps at all on the update. I thought there's no need to reflash the gapps while dirty updatin