The concept car had a 4.2L supercharged V8 engine. The production vehicle will likely have something a bit less powerful but still with some kick.
This car represents a new trend for Jaguar. They will be building about half as many of these each year than they built with the S-Type. The market they are aiming for is more luxurious, as the S-Type market included both traditional Jaguar buyers and Ford buyers who were taking that extra step up. Now Jaguar is trying harder to differentiate itself from Ford by building sedans that have the sleek look of a coupe, lots of options, and a higher sticker price. Executives hope this will move the Jaguar back into the luxury class with Mercedes Benz, BMW, and Audi, and out of that purgatory that is between the entry market and luxury market where brands like Volvo dominate.
These cars will be coming to a street corner near you soon. It will be a few years before you start seeing any show up on the used car market, as sporty luxury cars tend to stay in the hands of original owners for longer than normal sports cars or luxury cars.