Well at this point and time, I'm sure it's proprietary while the Flight Services group along with other in house organizations develop the Extended Envelope Training simulator data packages. After that they will sell these sim data packages to the various sim manufactures and airlines that are qualified to purchase them. Sim data packages can cost millions so while they may be "available" they are not likely to be handed out like business cards.
I have heard that most of the data is available for the existing Boeing fleets as it was captured during certification. Also have heard that the same cannot be said for the Airbus fleets?