Not much by way of news developments. I still don't believe the aircraft hit Phillips Rock. It may have crashed into submerged rocks not far out from Phillip Rock.
All the signs point to a stall on takeoff, it was struggling to make adequate airspeed once it left the water, and the port wings vicious drop points to a stalled wing.
Whether that was because there was inadequate power being produced by the PT6A, or because of a piloting failure, is yet to be found.
There's media fanfare about the aircraft being a "brand new plane", but the records don't show it as brand new, it was manufactured in 2016. It was "brand new" to the current owners, Swan River Seaplanes.
The aircraft was built in Aug 2016, initially registered to Wells Fargo Bank as N7129S, then de-registered and purchased by Whitsunday Air Services in late Sept 2016 and re-registered as VH-WTY. Ownership of the aircraft was transferred to Swan River Seaplanes, only a bit over a week ago.
There are some interesting points being raised in discussion. The maximum "demonstrated" crosswind speed listed by Cessna for the Amphibian, is 20kts. However, the POH says -
"Demonstrated Crosswind Velocity is the velocity of the crosswind component for which adequate control of the airplane during takeoff and landing was actually demonstrated during certification tests. The value shown is not considered to be limiting."
Despite the above, the takeoff of the aircraft in the crash was in pretty choppy water (the stated wave height limit is 61cm), and the local indicated wind speed of 25-27kts with gusts to 31-34kts certainly made the takeoff riskier than any smooth water, light wind takeoff. The operators use Thompson Bay because it's partly sheltered from Rottnests winds, which are pretty fierce in the afternoons.
Takeoff weight with 7 pax should've posed no overload potential, the Amphibian is capable of carrying 10-14 pax, according to the specs.
A second interesting point is the seatbelts. The pilot and co-pilot seats are fitted with 5 point harnesses. The pax only get lap-sash style belts. I would've presumed the uninjured survivor is likely to be the pilot, with his superior belt security - but I may be wrong.
A third interesting point is that many aircraft operators over water, insist that crew and pax undergo training to extract themselves from submerged aircraft after ditching and crashes. It's called Underwater Egress Training, and is compulsory as part of OH&S in many corporations where employees work out to sea.
It's long ago been proven that may people (pilots and pax) survive crashes into the water, but then drown when they become disoriented under water, and caught inside a sinking fuselage. You generally get a couple of minutes to escape a sinking aircraft, enough time to orient yourself and make it to the surface (if you're able to still move, of course) - provided you have UE training.
I don't know if any underwater egress basic advice is given to pax on seaplanes, but I would expect it should be - comprising a more comprehensive level of advice, as compared to the escape advice on land, is given to pax on commercial flights.