The final ATSB report is out.
Investigation: AO-2012-148 - Collision with terrain involving Cessna 172N, VH-JGR, near Kagaru, Queensland, 7 November 2012
Looks like insurers are now the contracted provider of ATSB investigative functions.
Insurance report
A representative of the insurer attended the accident site and examined the wreckage. The insurer concluded that JGR collided with the ground at about 50-60 knots at about 60°left wing down and about 20°nose down, at a high rate of vertical descent with the engine at idle power.