I doubt anything new is coming to Forza 7 in the way of new tracks. A small skeleton crew is working on it still and brings new features now and then, but the core team is without doubt busy working on FM8 for next gen, that includes the contractors who produce art assets, they're probably busy updating the current tracks for nextgen graphics, unlike the last time the tracks' topology is accurate and it's mainly the scenery that needs improvement, better trees and distant detail, maybe figuring out how to implement the lighting and weather from FH4 for all tracks and so on. Suppose Scarlett will be a fairly powerful machine, so all these things should be possible to have at 60 fps, the tools and OS features should transfer more easily than last time as well. Some systems in the game really need a complete rework and a new approach, a lot of the core stuff has remained the same since FM 2 and it's holding the game back. Forza carried this generation on it's back for Microsoft, so it's about time Spencer gives them the time to evolve the franchise in a significant way, something that cannot be done in an 18 months production cycle.