Re: What can be learned of the crash at this late stage?
We are, if nothing else, learning more about tracking and ocean movement of debris.
Agree with above posters that data is likely to be intact, although how helpful it may be remains an open question.
Finding the wreckage is one thing, recovering any of it is another. It's remote, likely to be very deep indeed, and in strong global currents. This will pose a new set of challenges.