I wouldn't bet on it, but here's hoping. As I and a few others have suggested, it's far safer to just assume this is going to be business as usual, a scenery pack, 4+1+200.The size or theme of the pack will probably tell us that.
I think it's also important to remind everyone that Frontier will never explicitly say when support is ending. They never did for Planet Coaster for example. The last pack was released, and sure it had a bit more content than usual, but they never actually said, "this is the last pack." The reason I want to point this out is because if our next and probably final DLC is just business as usual, for whatever reason (budgetary, staffing, etc), that doesn't mean there are more coming.