Thanks VME. That first fact sheet is fascinating reading.
It appears Inmarsat have been looking at these techniques since AF447. Certainly the range from the satellite stuff anyway. The doppler derived estimated of course and speed may have been more recent.
They have the fuel remaining at time of last ACARS. From this they believe fuel exhaustion would have occurred close to the last handshake.
And they seem to think last handshake was logon request from aircraft, consistent with aircraft equipment powering up - possibly following fuel exhaustion. So that fits with fuel calculations.
They also believe aircraft was descending at this time.
Intriguingly, they quote that study (Russian from memory) that suggests that in loss of control accidents the aircraft is usually found within 20NM of the last known position. So is there a suggestion they believe there was loss of control at the end - as opposed to a long glide from altitude and a controlled ditching.
Lots of independent validation, which is reassuring.