ZFT;
I'm not close enough to that area of the industry to say anything meaningful or helpful regarding the details of how, when, what such revisions to stall data for simulators may be introduced. I just read the industry informaiton like Flight, AW&ST, FlightGlobal and so on to stay in touch.
We know one thing: such introduction is going to have to go through a very robust process of technical testing and regulatory input and oversight prior to releasing any such performance data to be installed and used as a foundation for routine training with regard to recovering a fully-stalled transport aircraft. Whether the solution includes simulators capable of producing 'g' forces is yet to be seen, but I suspect that will be part of advanced simulators. I just flew these aircraft, nothing else.