Nokia's just announced the Wibree short-range wireless technology that it says will work alongside, or even replace Bluetooth thanks to the fact that it's ten times as energy efficient.
According to Nokia, this low-powered version of Bluetooth could work with gadgets like the Sony Ericsson Bluetooth Watch that only needs to communicate once in a very long while. Using Bluetooth, the watch would drain a lot of power doing nothing, but using Wibree (and shutting off Bluetooth), battery life could be greatly increased. Nokia's been talking with Bluetooth vendors for a while trying to get Wibree integrated into the Blueooth standard—obviously with little success.
To us, this just seems like one more standard that may or may not take hold, making gadgets that more inaccessible to regular consumers despite the energy savings.