UPDATE: The 2014 Infiniti Q50 (G37 replacement) has been revealed. Click here for all the official details and photos.

The current Infiniti G37 sedan will soon be replaced by the new Q50, pictured here in prototype form ahead of its world debut at the 2013 Detroit Auto Show next month, arrives. First sales will likely start in the third quarter of next year, making this one a 2014 model.

Though heavily camouflaged, the overall shape of the new Q50 sedan can be assessed, revealing plenty of influences from the Emerg-E concept car first shown at the 2012 Geneva Motor Show as well as the more recent LE concept. Distinguishing features include pronounced character lines, a fluid shape and Infiniti’s signature grille.

The new 2014 Infiniti Q50 also looks to be slightly larger than the model currently on sale, which should translate to more interior room.

The latest sedan, which once again spawn a coupe, convertible and high-performance IPL version, will share much in common with the next Mercedes-Benz C Class thanks to the alliance deal between Renault-Nissan and Daimler. This is expected to include cross-sharing of powertrains as well as some platform components.

Power in the 2014 Q50 is expected to come from an updated VQ V-6 engine, though a four-cylinder diesel sourced from Mercedes-Benz will be offered in certain markets. A 3.7-liter displacement is expected to remain for the V-6.

The diesel, which hasn’t been confirmed for the U.S., is tipped to be the 2.1-liter four-cylinder found in various Mercedes models including the recently launched 2013 GLK250 BlueTEC. A hybrid model will also be launched using a similar powertrain to the one found in the Infiniti M35h.

Of most interest to performance fans is the possibility of a high-performance IPL version of the new Q50 sedan (the current IPL models are limited to the G37 coupe and convertible bodystyles). Look for turbocharged power this time as well, giving the IPL Q50 a better chance against new versions of the BMW M3, Lexus IS F and Mercedes-Benz C63 AMG all due in the next year or two.

We'll keep you updated as development of the 2014 Infiniti Q50 continues.