Bluetooth might not be great. The max transfer rate is something like 24 Mbit/s (3 MB/s), and say a single RAW file is 20 MB, then you'd be looking at about 7 s

Bluetooth might not be great. The max transfer rate is something like 24 Mbit/s (3 MB/s), and say a single RAW file is 20 MB, then you'd be looking at about 7 seconds of transfer time for each photo. With high quality jpegs ~5MB it would be closer to 2 seconds per picture. I think you'd need some kind of direct cabled connection for good perf for professional photographers. Not to mention getting all the camera and app providers to standardize on a protocol and set of features.