Front wing is carry-over part on those photos. Front suspension is new (rear top arms more inclined downwards), so the chassis is new as well. Sidepod inlets giving big Haas VF-22 mockup render vibe. Rest of the sides is further improvement over final 23 spec, airbox is slightly smaller. Engine cover seems further refined a bit, same as DRS pylon and fairing
With these unexpected side inlets, I'd say McLaren is opening up a different development path in this area, just like RB is doing with overbite RB20.