Well, the rugged little timekeeper is packing Bluetooth 4.0 in its bag of tricks, which lets the wearable gadget communicate with your smartphone.
It should also be possible to talk to the Apple Macbook Air and Mac Mini ? Which also has Bluetooth 4.0 – I wonder what profiles they would support and how I can extend the functionality … Cant wait to get my hands on these toys..
more @ Casio’s Bluetooth 4.0 G-Shock is water and shock-resistant, FCC-approved — Engadget.
Neosis - Dennis Mathews' Blog 
did the bluetooth on the G-shock applicable with any mobile in the market. my mobile – Samsung ACE.
As long as it is Bluetooth 4.0 it is compatible. The latest phones are expected to be Bluetooth 4.0