Despite is official launch being more than a year away, technical details of the next-generation 911 have leaked from Zuffenhausen’s headquarters.Porsche’s latest rendition of the most successful sportscar of all time carries the internal design code 991. The first 911 to be launched under VW ownership won’t radically alter shape (which 911 ever has?) yet some very clever engineering has been integrated.First of all, the new 911 will be lighter, despite being slightly larger overall. This is due to a new aluminium/composite blend body. The newfangled bodywork should trim mass by 45kg in stock Carrera form, rendering a 1 370kg kerb weight. In terms of detailing, Michael Mauer’s styling team have altered the headlamps and tail lights slightly, whilst embellishing the 991’s illumination with new LED graphics. Airflow management improves with a tweak to the rear spoiler. The new car’s rear axle moves 76mm backward (elongating the wheelbase); a change sure to benefit both cabin space and high-speed stability. Usability improves as the 911's nose area luggage capacity increases from 135- to 140l, whilst cabin ergonomics gain a cleaner feel with the presence of a push-button parking brake replacing the classic girdle-actuated system. Seven-speed manualMechanically the water-cooled flat-six engine line-up is carried over in similar 3.6- and 3.8-litre capacities to the current 911. Optimisation with the aim of lowering emissions (courtesy of advanced direct injection) will result in more efficient combustion which should benefit performance too.Expect the 3.6l engine to gain 14 units of additional power (peaking at 268kW) and supported by 400Nm. The larger 3.8l engine powering the Carrera S will become the first non-GT or Turbo 911 to break the magic 300kW threshold, producing 305kW – a noteworthy improvement of 22kW over the current model. Torque swells to 440Nm from the current car’s 420Nm.Channeling the new 911’s power will be the obligatory six-speed manual transmission augmented by a dual-pedal seven-speed PDK option. Stop/start technology and brake energy recuperation features are integrated in the suite of mechanical features to ensure the new 911 returns stellar fuel consumption figures and has as low an emission signature as possible.European insiders also report Porsche is secretly developing one of the most elaborate dog-leg H-gate transmission systems ever offered in a road car, featuring seven-gears, and due to debut in the 991. Shoring up the 911’s fabled agility will be a redesigned multi-link rear suspension configuration, standard electronically managed locking rear differential and (controversially) a switch to electro-mechanical steering. When the Carrera 4S model arrives by October 2012 expect it to sport the latest in torque-vectoring technology (enabled by interplay between the all-wheel drive system and individual brake rotor pulse technology) to sharpen up the driving experience even more. Porsche’s tenth-generation 911 will debut officially at the Frankfurt motor show in September 2011.