It will have a twin turbo 3.8litre V8 managing to get out 592 BHP from it and it will have some Formula 1 tech in it.
Dual clutch and obviously a flappy paddle gearbox.
The MP4 stands for McLaren Project 4, the chassis designation for all McLaren Formula 1 cars since 1981
The '12' refers to McLaren's internal Vehicle Performance Index through which it rates key performance criteria both for competitors and for its own cars.
And C is for Carbon since the car is mostly build out of, carbon fiber.
The McLaren MP4-12C might not have the highest top speed, but it will surely wreck a Veyron in a proper track.