And it's a lot closer to ready than we thought; McLaren Automotive CEO Mike Flewitt announced at its Palexpo media conference that he expected the auto to make its public debut before the end of 2018, and that it would have a name, like the Senna, rather than a number like the 720S, which will be announced at the same time.
Another six months have now gone by, so McLaren feels the need to deliver another tease for the BP23, this time with a design sketch giving us a first look, and the new that the BP23 will have a top speed in excess of 243mph, making it faster than the F1.
The BP23 "Hyper-GT" will be joining the Ultimate Series of McLaren cars following the McLaren Senna features centrally-mounted driving position inspired by F1 road auto and a public reveal of the vehicle can be expected this year.
The limited production run of 106 units quickly sold out, despite a price tag starting above $2 million.
The next addition to the McLaren Ultimate Series will be the most luxurious McLaren ever according to Flewitt.
The BP23 will hit the highest top speed of any McLaren yet.
Finding a driver will be equally challenging, though one likely candidate is Swedish racer Kenny Brack, who serves as one of McLaren's development drivers and who set a 6:43.2s lap at the Nurburgring Nordschleife in a McLaren P1 LM.
A new McLaren Ultimate Series auto will arrive later in 2018 - codenamed McLaren BP23 - and it will, in many ways, be the spiritual successor to the legendary McLaren F1.
McLaren played down our suggestion that "Lauda" might be used - on the basis that unlike the Senna, BP23 has more of a road bias. McLaren Tasman, anyone? The guessing begins here.