Update: The 2014 Cadillac CTS has been revealed. Click here for all the details, photos and video.

Even through bankruptcy, bailouts, and a bad economy, the Cadillac CTS range has continued to buoy the brand's reputation and rank amongst luxury competitors.

It's a very, very good car in many ways--so updating the complete range for 2014 is perhaps the most important thing Cadillac has on its table right now.

These latest spy shots of the 2014 CTS show its progress, including shots under the hood and inside the cabin. The engine cover shows a "Twin Turbo" logo, indicating that these are twin-turbo V-6 prototypes testing for a high-performance version.

So far, there's not much in the way of visible difference.  Not that the differences aren't there--they're just cloaked under heavy sheets of camouflage. The placement of the camouflage itself tells us something about the 2014 CTS's updates, though.

The hood, front fascia, front fenders, and headlights will all be new for the 2014 model, likely sharing some family resemblance to the new 2013 ATS sedan, though also likely in a more dramatic, edgy way. We can see that the grille is significantly larger than the one on the current model, and it looks like engineers are testing some aero pieces on the front bumper's leading edge.

The rear will also be fully revised, judging by the covers. The tail lights look to feature LED lighting, while the head lights get small vertical LED daytime running lamps, too. Trapezoidal tailpipe outlets and an integrated rear diffuser appear to be part of the mix, blending the upward angle of the car's rearward underside into the bumper.

Changes are in place at the side of the car, too. In profile, the roof appears more rounded, particularly at the rear. The side mirrors are shorter and slimmer, with integrated turn signals. The shape of the rear side windows looks to be slightly different as well, with what may be slightly thinner C-pillars behind them.

So far, information on the mechanical underpinnings of the CTS are scarce. It's likely to be built on the same Alpha platform as the ATS, but beyond that, specifics like engines, transmissions, power, or gas mileage are in the dark. Even being based on the Alpha platform is a rather abstract concept these days, meaning little more than sharing some components on a potentially very different chassis. Coupe and Convertible versions of the 2014 CTS could be possible, though there's a chance they won't be.

Inside, there will be plenty of luxury and generous space for five adults. Dominating the cabin will be a large capacitive touch-screen display for the CUE interface system. It will be joined by a second display screen serving as a digital version of the instrument gauge cluster.

We'll keep you posted on development of the 2014 Cadillac CTS as it progresses.