
Quoting Top Gear magazine "It’s also the first McLaren with a proper manual gearbox since that aforementioned F1 supercar, and while details on this car are short, we know it’s matched to a V8, sending drive to the rear wheels, packaged inside a lightweight carbon fibre shell."
[Aside: Going back to Stuart G's comment, I hadn't realised (possibly as I'm not in the market for one) that there had been an "Artura debacle". So I had to go and look. Explained in the vid below.]