We've known for a while that McLaren would add two cars to its Ultimate Series; a successor to the P1 developed under its Track22 plan and a three-seater code-named BP23. UK publication that McLaren could add a new member to the Ultimate Series before the end of this year. Apparently, it's a track-ready monster with performance better than a P1.
Autocar reports that the car is code-named P15 and will utilize the same carbon fiber Monocage II tub that made its debut in the 720S. Interestingly, the P15 is said to use a development of McLaren's 3.8-liter V8, the M838t, which has seen duty in basically every single car the company has built. Autocar says it will produce 789 horsepower.
The P15 will also reportedly be more track-focused than any other McLaren road car built, and as such, will have a carbon fiber body and active aerodynamics. There also won't be much luggage space either—apparently, there's just enough room for two helmets and racing overalls.
Autocar says that the P15 will weigh less than 2866 lbs. and could match or beat the P1's acceleration times. Only 500 examples are set to be built, each with an asking price of £700,000 ($913,000 USD). McLaren might show the car to customers later this year, but the public might have to wait until the Geneva Motor Show next March to see it.
When asked for comment, a McLaren spokesperson told Road & Track that "we can confirm that we are working on new product to be launched within our Ultimate Series during the period of Track22 in addition to BP23."
This statement doesn't really confirm anything—it simply reiterates McLaren's previously announced plans, but it also doesn't shut the door on the P15. Hopefully we'll find out soon whether this car is real, or just a wild dream.