Jaguar has prodigious plans for its revival, but laying blueprints on a table is effortless; anyone with a pencil and some 20-lb paper stock can do it. Eventually, you’ve got to show us what you’ve got. Paul Alcock, project manager of the XF, said “the most significant change in 2012” is the addition of the 2.2-liter diesel to that line, and the engine is joined by tech like Intelligent Stop/Start, an eight-speed ZF transmission with drive-disconnect, and aero improvements honed by computational fluid dynamics. @funkmasterflex