This STS Sporthatch is probably no more relevant than my Coupe DeVille below, but I'd like to think in a few years, Americans will be more open to the idea of a luxury hatchback. They're just so practical. They can carry larger objects in the luggage area than a sedan, yet they have the same profile as a car, meaning you're not carrying around a crossover's heavy and taller body when you don't need to be.
C H O P — Falling somewhere between the length of a CTS and an STS sedan, this Sporthatch would fill a niche similar to a crossover, but with more sedan-like panache. Powertrains could be direct-injected and turbocharged I4s and perhaps a new-from-scratch inline 5 turbo-diesel for maximum power and torque. I'm not sure a hybrid drivetrain would be appropriate when carrying space is the priority due to the bulky battery packs necessary, but perhaps in another ten years lithium ion batteries will be much smaller and lighter allowing their use in any vehicle.