I suppose its a coincidence that ATC were unable to make contact a few mins before the left turn and rapid climb but have any of the unofficial reports or briefings mentioned or implied they heard the crew speaking or just alarms sounding?
Edit:
Nearest I can find is..
http://www.nydailynews.com/news/worl...icle-1.2087107
The voices of the crew were drowned out by the warning alarms, said the investigator from Indonesia's National Transportation Safety Committee.
Edit 2: Ok so at least they were heard to say something....
http://www.wsj.com/articles/airasia-...825697?tesla=y
“The warning [alarms] kept on screaming, and in the background, they [the pilot and co-pilot] were trying to recover the plane,” said the crash investigator. “But what they said wasn’t clear,” the investigator said.