I don’t think the nose will be that much higher than in previous years. It’s clearly on a slanted platform, which is giving the illusion of the nose being higher. I mean, there is no way that the front wing is that high off the ground ;)
I’d say, if anything, it’s the airbox above the driver that looks differently compared to last year, the last one was very flat on top and slanted downwards, whereas this iteration seems to be shaped quite differently. Obviously mere speculation though.
First of all, it’s pretty obvious that the car is placed on something which is making it appear taller. Look how high the tyres are, and the front wing. Once you realise that, the nose looks relatively low – as we’d generally expect from McLaren’s latest crop of F1 cars.
Also, this could quite easily be last years car. The purpose of the video is to build up hype – and with a cover over it, it doesn’t matter if it’s the new one or not – it does exactly that.