Originally posted by RGlasel I'm puzzled why Bluetooth connectivity is needed for a DSLR, unless it is to replace IR remotes. Bandwidth is far too slow for tethering at any range and the tradeoff to increase the range is to reduce bandwidth. The primary benefits of Bluetooth are low power consumption and making quick connections, although IR remotes beat Bluetooth in both categories.
It seems that the trend is moving away from having GPS modules in the camera, and putting that functionality as part of everyone's ubiquitous mobile/cell phone. Using BluTooth allows for a relatively easy way to interface external GPS and do additional functions.
It would also not surprise me if audio monitoring or recording was done via Bluetooth. Since to my knowledge that functionality does not exist in any other camera manufacturer natively, it might be a way for Pentax/Ricoh to differentiate the camera from the others.
The Sony MI shoe, is an excellent example of an interface that can be used for flash, and other "smart" devices.
Since GPS modules are usually put under the Hot Shoe, and require a plastic/composite cover, that would lend more credence to the GPS going BlueTooth and making room for something different under the hot shoe.