Mercedes-Benz has revealed the first details and images of its monstrous G63 AMG wagon in the run up to the 2012 Beijing Motor Show.

The new G63 AMG will join the diesel-powered G350 in the refreshed line-up, replacing the old G55 AMG model. Along with a new powertrain, the flagship sports variant benefits from a more aggressive exterior design and a more refined and car-like cabin.

An all-new front bumper conveys a sense of more power over the standard bumper fitted to its predecessor, along with a unique grille and larger wheel-arches. AMG’s familiar five-spoke wheels fill out the wheel wells and quad-exhaust pipes are also featured, which exit in pairs below each rear door.

The interior benefits from similar upgrades to the G350, incorporating a new instrument panel with TFT display; large central screen with Comand system, satellite navigation and internet connectivity; Bluetooth connectivity and voice control. Carbon fibre and satin silver surfaces create a premium ambiance on par with the luxury German brand’s passenger vehicles.

Replacing the G55 AMG, the G63 is powered by Merc’s new 5.5-litre bi-turbo V8, with 400 kW and 760 Nm that out-guns the previous supercharged engine’s 373 kW. Above the G63 AMG is the G65 AMG, powered by the familiar 6.0-litre twin-turbo V12 engine, delivering a huge 450 kW and 1000 Nm of torque. Both engines are matched to a four-wheel-drive layout and a seven-speed automatic transmission. Despite the added power, fuel consumption falls more than 13 per cent to 13.8 L/100km.

The 2013 Mercedes-Benz G-Class range will go on sale in Europe later this year.