The official report isn't out but I bet the teams at the airlines and manufacturers already have a damn good idea of exactly what the sequence of events was leading up to the accident.
They will know many things that could be done to the aircraft to prevent a similar accident happening again e.g. increase the penetration resistance of the wing fuel tanks, make the tyres less likely to self-destruct if they get damaged at high speed, remove any possible source of ignition (as it looks like it wasn't an engine afterburner that ignited the leaking fuel), look at the flight and ground crew actions (is there something else that should be done differently now that we have more knowledge of how Concorde behaves in this flight regime) and so on.
The chances are that the report will recommend/require some of the changes currently being made, and if so, those changes will already be in place and time won't be needed to implement them. There may - probably will - be other recommendations/requirements.
In any case, BA are very keen to get the Concorde back into passenger service asap, and by doing some of the work now, they will be able to bring the aircraft back into service all the sooner.