My theory is that they'll go with white, partly to keep it original (!), but also to match the eponymous horse. It also has a bit of a race car vibe.
I think the pastel greys and greens are a bit of a nod to original Mini engine bay details.
Watch me now be proved completely wrong and a Barbie-pink/ metallic grape monstrosity emerge from the paint shop. The suspense is a killer.