McLaren Speedtail looms

If you're a supercar nut, you'll probably want to put October 26 in your e-diary because that's when the maddest McLaren ever made will lob.

The McLaren Speedtail will have a top speed of almost 400km/h, generate 735kW, will cost more than $3 million a pop and no, you can't have one. They're all sold.

The spiritual successor to one of the world's most celebrated supercars, the 1990s McLaren F1, the new Speedtail will once again offer a 1+2 seating layout, with the driver in the front central position with two flanking passengers slightly aft.

In total 106 McLaren Speedtail hypercars will be built.

According to the Woking-based car-maker, each and every one of the $3.2 million (£1.75 million) four-wheeled weapons have been sold.

It's not yet clear if any of the blazing machines will be headed to Australia.

McLaren has developed a new hybrid powertrain blending the instant torque of electric motors with a beefed-up version of the British brand's turbo-petrol V8.

The result will be a 1000hp beast, which is around 735kW and enough firepower to make Aston Martin Valkyrie owners take notice. That said, the more expensive V12 Valkyrie has more power: 1130hp (830kW).

Part of its Ultimate Series vehicle class in which the McLaren P1 is a member, a single image of the McLaren Speedtail's unique rump has been released showing a smooth and slightly curved tail section.

Look closely and you'll notice score marks near the outer edges, suggesting active aerodynamics will play a big part in the Speedtail's downforce, braking and indeed cornering abilities – particularly if the left and right flaps can be actuated independently.

The arrival of the Speedtail sees a continuing escalation in the evolving supercar war, with the Aston Martin Valkyrie, Mercedes-AMG ONE and several other potential fighters like from the likes of Audi, Ferrari, BMW, Australian group Brabham and even Hyundai.

Codenamed the BP23 during development, the McLaren Speedtail will be unveiled at a private event in London at lunchtime on October 26. Set your alarms folks, because that's about 11pm Australian eastern standard daylight savings time.