One important thing about the iPhone 4s announcement that widely went missed, was that it will be the first Bluetooth 4.0 handset period.
As the newest version of the wireless communication technology, Bluetooth 4.0 is a low-energy technology. With this 4.0, devices like the iPhone 4s that constantly transfer data back and forth to other wireless devices can benefit from it. In addition, you will no longer have to worry as much about draining your battery from using Bluetooth. Devices like hands-free communications and wireless headsets for music will also benefit from the Bluetooth 4.0’s low-energy technology.
It will take some time before it is widely adopted, but when it is, we’ll be looking forward to it.[CNET via Apple]