Here is the DM article with the area that the yellow fin stingray heard two separate pings that is quite promising.
The area is 330 miles north of the Chinese ping along the 811 arc.:
The first signal lasted two hours and 20 minutes before it was lost. The ship then turned around and picked up a signal again - this time recording two distinct ‘pinger returns’ that lasted 13 minutes, Mr Houston said.
‘Significantly, this would be consistent with transmissions from both the flight data recorder and the cockpit voice recorder,’ Mr Houston said.
If this turns out to be it then they will have to adjust the MH370 flight path and speed once again.
The max speed of a 777, from what I’ve been able to gleen, is 590mph, hammer down. Since the new suspected splash spot is shorter in distance from the turn, than any of the three predicted flight paths, this evidence of lack of fuel conservation is counter to any argument that the objective was to find a safe landing spot.
On a side note, I’m very interested in the tacking pattern prior to the southern turn. Was it deception of the passengers? (would the tacking have been the same on the trip to Bejing?) did a passenger takeback attempt begin at the southern 270degree turn? I just can’t envision an Aussie, much less an American, sitting quietly in their seats while all this was going on.