I believe that eventually, that Captain Sim will upgrade all of their FSX products for P3Dv4.x. But... It will be a long slow process, and I have no idea of the priority of what order the products will be done in, other than the first four listed here: Prepar3D 4 upgrades, which does not include the 757 Captain III, which is the second one ready for P3Dv4, so even that list is not very accurate. ;)