Last I heard the ATSB are investigating, but given an apparent high speed impact, fire, no CVR or FDR and apparently no aviation experienced, eye witnesses, the possibility exists that they won't have much more to go on than what we can glean from the press reports.
I remember my own GA to RAA conversion and cocking up an incipient spin recovery - thinking back on it, a loose camera, fire extinguisher, headset bag etc flying into the footwell could have made the situation difficult to recover from. Yes they should all be securely stowed, but things work loose and many aircraft don't have any real way to secure loose items anyway.
I quite agree about the coroners reports though, with a couple of exceptions they have only the haziest appreciation of the activity they are investigating, an over developed god complex and are prone to getting diverted into irrelevant side issues.