Originally posted by Drinkkeri No you can't for bluetooth is designed just for minor data transfer for remote control audio etc. and has max 3Mbps bandwidth and that is slower than the slowest wlan currently in use (11Mbps 802.11b). Also there is no video streaming protocol for bluetooth at all.
Any camera operating commands can be sent via basic radio signal without fancy name and when using separate screen the lack of lag is essential so cables are needed.
edit: Also, why is that every time there's a new gadget in any other camera than Pentax someone thinks it's a must have feature that must be added in Pentax cameras as soon as possible?
A quick google search for "bluetooth webcam" finds at least one webcam that transmits 640x480 @ 15 fps over bluetooth 2 (max speed 3 mbps as you said) but BT 3 has a max speed of 24 mbps. What prompted this was something I saw about BT4 specs being very close to finalization and a question about geotagging, which could also be implemented over a BT interface.
Wired firing is always faster and it commands can be sent wirelessly, but my feeling is that those are pretty closed systems and they will never be utilized beyond the original inception of how the designers/engineers intended it to be used. If you implement something that is standards based with an API that allows creative people to go to town rewriting software, you will get some very innovative uses just like you see with any PC, the internet, the iPhone, and the CHDK project.
Remote viewfinder is actually a small part of how I would envision utilizing this kind of system. I think writing macros to queue up shots would be very useful in certain situations and I think that being able to store virtually unlimited user mode setting profiles would be very useful in a situation where you are moving between rooms or inside/outside and you could change every setting in the camera with the push of a button. Or if you don't like the setup of where buttons are, how you navigate through the menu you could write a remote control app that lets you set it up as you want it.