With one of the earliest findings being a probable airspeed disagreement it seems unlikely that the airframe could be completely blameless in all of this. However as someone said earlier, recommendations have already been issued in that regard.
What has been the primary remaining mystery has been the failure of the crew to work through the problem. Hopefully this is what we will get the answer to in the next few days.
The secondary unknown has been the precise mechanics of the final fatal upset. That should always be of some considerable interest to the airframers even if the causes are not directly attributable to the design.