The 650s replacement, dubbed as the Baby Mclaren P1 is only currently known by its internal code, The Mclaren P14.
Not much information has been released about it and reading on CarandDriver.com the Mclaren P14 will be totally different to that of the 675Lt which derived from the 650s which was reworked off the 12C.
It will be based on a CarbonFiber tub and powered by a tuned 3.8Litre V8 Twin Turbo engine. Its competitor will be the Ferrari 488GTB so you can bet that the performance figures will outway that of the 661bhp that the Ferrari is pushing out.
Que the videos of the Ferrari 488 vs The Mclaren P14 or whatever it will be called when it gets released.