All this speculation about blocked probes et all seems very premature and unfounded up until now if you ask me.
Looking at the first data (flight path, descend speed) there is literally nothing that suggest probe failure whatsoever.
No erratic up and down motions, no stall, no excessive descend speed.
What is very strange is the straight path flown right up until impact, no attempt whatsoever to aim for one of the many possible airports nearby.
This looks more like the Helios 2005 crash (with the exception of the long flight up until fuel starvation) than anything else, loss of pressure (explosive decompression ???) and subsequently crew incapacitated.
They cannot rule out anything up until now, everything from equipment failure to accidental explosion or even sabotage/terrorism is on the table.