The GT2 seeks to trump the horsepower output of the Venom GT in a major way, upping the total pony count to 1,500 versus the older car's paltry 1,200 hp. That heroic output is produced by a 7.0-liter twin-turbo V8 engine, and is attainable running plebian E85 pump gas – like a boss. The 1,500-hp figure is significant, too, as it represents one horsepower for each kilogram of weight the car carries.
Other additions for the Venom GT2 include an available seven-speed "paddle shift transmission" of unknown origin, a bump in headroom thanks to the double-bubble roof and aero improvements that drop the CofD from 0.44 to 0.42.
Look for this unmitigated beast of a hypercar to make its official debut late in 2013.
UPDATE: This just in from John Hennessey regarding the 2014 Venom GT2. We're told that the car will carry a sticker price of $1.25 million to start, and that the optional seven-speed paddle-shift transmission will be a $165,000 option. Further, Hennessey will continue to sell both the Venom GT and the Venom GT2 – the new car is not a replacement for the older, in other words.