The "initial data" in this report reminded me of last year's crash of the A320 AirAsia flight in Indonesia, in which the "initial data" suggested 6,000 fpm, sudden climb, sudden descent, etc… although weather was a big factor in the case of AirAsia. But the two seem eerily similar in that they were fairly soon after reaching cruise or near-cruise altitude, then sudden high rates of descent, etc.., then uncontrolled descent and impact without explanation.