Cadillac wasn’t secretive that it was showing a concept version of it’s upcoming XTS flagship, but GM’s luxury brand certainly did hide the fact that it was a plug-in hybrid. Until now.

Set to be unveiled at the Detroit Auto Show, the XTS Platinum Concept certainly looks like a true flagship for the premium brand. Finally, there’s a Cadillac that wouldn’t look out-of-sorts parked next to a Mercedes S-Class. Size wise, it’s definitely large measuring 203.5-inches (3.5-inches longer than an S-Class), however, the wheelbase is considerably less at 111.7-inches (about 8-inches less than an S-Class). It is also roughly one inch wider than an S-Class.

Sadly, the XTS isn’t rear drive, however, it does feature an all-wheel drive setup. Added handling and agility are provided thanks to 20-inch wheels, and GM’s Magnetic Ride Control (MRC) shocks that measure the road every millisecond and adjust just as fast.

As for the plug-in hybrid system, it uses an electric motor, lithium-ion battery and a 3.6-liter direct-injection V6 gasoline engine to make 350-hp and 295 ft-lbs of torque. Capable of operating as a conventional hybrid, thanks to the plug-in capability, Cadillac claims it can achieve up to twice the efficiency of a conventional hybrid in city driving. The lithium-ion battery can be charged fully in just five hours using a conventional household outlet.

With an imposing look and a powerful and efficient engine, we’re possibly most impressed by the car’s interior. As a concept, it takes Caddy’s “Platinum” line philosophy to the extreme, using ultra high-grade materials and keeping with the Platinum mantra to hand cut and sew the interior leather. There’s also plenty of suede and we even have to admit the wood trim (which we typically hate) looks stunning.

The Cadillac XTS is scheduled to go into production in the near future and we’ll be sure to keep you updated on how close to the concept the production model will be.