McLaren are not launching "a new F1", but it is correct that MSO is working on what I believe is called 'Bespoke Project 23' which will feature a 3-seat chassis with a layout similar to that of the F1, and should use the M840TT drivetrain that will be revealed in the upcoming 650S replacement. I think it is a great idea and the high level of interest from potential customers seems to confirm that opinion.
>8^)
ER