Our spies have managed to catch the 2012 Mercedes GL undergoing testing alongside the SLS AMG Roadster.

Our spies have managed to catch the 2012 Mercedes GL undergoing testing alongside the SLS AMG Roadster.

While the SUV/crossover is heavily disguised, we can see it will be larger than the current model and feature a bold front fascia with a massive grille that mimics the facelifted R-Class. This particular prototype also has AMG wheels and a high-performance braking system, which could indicate that it's a GL63 AMG or a standard model with an AMG performance package.

Engine options remain a bit of a mystery, but we wouldn't be surprised if choices include a twin-turbo 4.6-liter V8 with 435 PS (320 kW / 429 hp) and a 3.0-liter turbodiesel with up to 258 PS (190 kW / 255 hp). On the other hand, the GL63 AMG is expected to use a twin-turbo 5.5-liter V8 with 544 PS (400 kW / 537 hp) and 800 Nm (590 lb-ft) of torque.

As for the SLS AMG Roadster, it will feature a 6.3-liter (6,208cc) V8 with 571 PS (420 kW / 563 hp) and 650 Nm (479 lb-ft) of torque. Connected to a seven-speed double-clutch transmission, the engine will enable the drop top to accelerate from 0-100 km/h in 4.0 seconds and hit a top speed of 309 km/h (192 mph).

The SLS AMG Roadster is scheduled to debut at the Frankfurt Motor Show, while the GL will likely be unveiled late next year.

2012 Mercedes GL spied with SLS AMG Roadster