I don't really know why Jaguar feels they need more than 3 flagship SUV's. With gas prices on the rise you'd think their last concern would be with a model that sits above the F-Pace. I've also heard that they are interested in making another sports model to sit alongside the F-Type. Looks like we may still be a ways off from any XS news.
As SUVs and pick ups improve MPG rating so are their sales, not only that but so is the transition of people moving from sedans to SUV's. The first thought people have of buying an SUV is the horrible gas mileage. J-Pace is a key product that rivals the Porsche Cayenne.