To my mind there was never been an "under the radar" update in terms of either hardware or software to a FBW Airbus type.
If Airbus make some modifications on their aircraft after the AF447 accident (related to) ... this will be the explicit recognition that their plane(s) had problem (s) (was not sure) before the accident ...
So in effect .. this will not be beneficial for Airbus and may have unfortunate consequences for Airbus at the trial (even if their answer is "we don't know before")
And it's in contradiction with their former declaration in the press ...