FWIW I've seen a post on another forum (Mode-S receiver related) from someone who logged the crashed aircraft on his system this morning.
The last data recorded (on a system that does make use of QNH data, so should provide accurate altitude information) indicated 400ft and 88kts.
Make of that what you will.
And bear in mind when interpreting this that the height and groundspeed readouts don't necessarily apply to exactly the same point in time, such is the nature of Mode-S/ADS-B.
The post referred to also states a final position readout (i.e. last before the aircraft descended out of coverage) which corresponds to approximately 8,000ft short of the 18R paved area - again neither the height nor GS values necessarily correspond to that precise position.