The image shows a large empty paved space, with a pavement surrounding, plus seating area for goodness knows who.
That space is essentially the same shape and size of the existing former BMW group car park behind Tesco, a link with an overhead map of the area is here:-
Find local businesses, view maps and get driving directions in Google Maps.
maps.app.goo.gl
So what's the point of this big empty space? A railway station car park for people from South Oxfordshire area with little access to public transport? Will there be similar at the Science Park?
I can't quite decide whether it's raised up and maybe an underground car park? It seems to be the same height as the Tesco cold store from some angles.