This will prove to be good news for those who were slightly disappointed to see Nokia’s new Lumia devices were only going to support Bluetooth 3.1. According to a listing on Bluetooth.org, both the Lumia 820 and 920 support Bluetooth 4.0.
Bluetooth 4.0 allows for the transfer of information from super low power devices. The reason it’s a big deal is that it will allow for things like workout monitors, everything from a pedometer to a heart rate monitor.
What isn’t certain at this point is how well supported Bluetooth 4.0 will be on an OS level, if at all. Microsoft has just gone RTM with Windows Phone 8 and as of yet we are still wondering about a great many details. It’s certainly a good sign though; if the Lumias have been certified then it’s unlikely is only to allow proprietary Nokia applications to use it.
The applications we’re likely to see use this type of technology is generally going to be sports tracking apps. Nike for instance has their Fuel band, Running, Training devices which help record a workout. But there's of course room for other projects to fit in.
920 is looking like the device to beat .. already. the last sore spot in the earlier specs has been cleaned up
edit: Just saw GP007's thread . can a mod pls delete this tread