It would be really nice to have this. This is the next step in image geotagging
A few geottagging software already have it (ex geosetter)
Many of the new camera GPS equiped also have electronic compass to embedd the image direction.
On top of that we could also have subject location, so that we can locate what we were photographying.
(for example selecting a photo with that metadata will display the photo marker for the position of the camera and a target marker for the position of the subject.
regards