The CVR transcript is pretty damning I'm not sure what new details you expect them to uncover.

The alerts from the GPWS below 1000' signify an unstable approach, you go around, the end.

What they will investigate is the why they did not go around, but it's largely irrelevant.

It would be irrelevant if the pilots died, however, since they survived and potentially will continue flying, the why is relevant to not do it again