As far as I know this is the only Boulder Gray photo we're seen.It appears the new photo of the car on the trailer is the Brilliant Silver, while the leaked photos from earlier this year are the Boulder Gray.
It will be an identical color to the rest of their fleet in boulder gray. Which does look very blue in certain light.^ I really love that colour as shown, but I very much doubt it will be that blue toned IRL. Pity.