AF447: What will they find in Black Boxes?

Could new attempts to raise black boxes by investigators of the AF447 disaster be nothing more than attempts to exonerate all responsible parties?

Has Airbus, Air France, the FAA or any other manufacturer or regulator conducted testing inside 70,000 ft thunderstorms?

Have French officials, Air France, Airbus or the FAA been able to explain why the Air France dispatch office, a recipient of regularly updated satellite photography, was unable to inform AF447 of extremely severe weather in the flight path assigned to AF447 by that same dispatch office?