Sad end to an old lady and the occupants.
The photo geometry may be adding some foreshortening, but the aircraft would appear to be in a relatively nose high attitude. The attitude itself is not indicative of AoA, except that where there is limited performance, there is not too much opportunity to trade "speed for height". If any video survived the event, then it may be able to reconstruct the speed using broadband noise SPL, there is substantial airflow noise on these types of aircraft. Any engine faults may also be detected through video with a spectral analysis. The choices of causation for a steep flight path impact in clear weather are fairly limited, and will be able to be determined from the wreckage that remains. The State investigators will do a comprehensive analysis, and will most likely determine the probable cause of the accident.
Operating limited performance aircraft in rugged terrain can be challenging, even without other factors stressing the op. I for one would hate to see excessive regulatory response to the operation of the older aircraft types, they provide an insight into where we have been and thereby give some meaning to where we are. There is inherent risk, but then we dont get out of life alive, and we are here for the experience.
RIP to all on board.
PS, I still fly some WWII aircraft, and others around the Korean war vintage. They are different, exude character, but they are different.