http://9to5mac.com/2015/10/09/bluetooth-4-2-iphone-6-ipad-air-2/
I find this very interesting. Hopefully it is a firmware update and not new hardware, but even at that the Apple Watch page still says 4.0 so it wouldn't really make a difference for a lot of people.
What are your thoughts on Bluetooth 4.2 on older devices?
Although it’s unclear whether a firmware update or changed hardware inside more recently manufactured iPhone 6 and iPad Air 2 devices is responsible for the new Bluetooth 4.2 support, upgraded firmware might be the answer. In the past, Bluetooth 1.0, 2.0 and 3.0 devices could not be upgraded to newer versions of the standard, but Bluetooth 4.0 devices were able to upgrade to Bluetooth 4.1 using product-specific software patches. Some reports have suggested, however, that Bluetooth 4.2’s speed and data capacity improvements would require new hardware, making Apple’s implementation somewhat curious.
I find this very interesting. Hopefully it is a firmware update and not new hardware, but even at that the Apple Watch page still says 4.0 so it wouldn't really make a difference for a lot of people.
What are your thoughts on Bluetooth 4.2 on older devices?