Wow, it's so well camouflaged you almost can't see it.....what a great way to avoid attention. At least it's testing on US roads now. I just want to see a shot where it's right next to something of known proportions so I can get a better feel for its size.
It's a stretch, but the car ahead of it seems to be one of the usual old chevy minivans. The perspective could be playing tricks, but it seems like the xover is pretty equal in comparison. It looks like much of the size has been added near or above the beltline in the upper half of the vehicle.
Hard to say... looks like the front glass is taller than the rear glass by a good bit (kinda clubman-esque but more). And looks to me like the beltline has been raised an inch or two... though it's hard to tell with camo and the angle. Need a side-by-side of this photo with a clubman from the same angle - with both scaled so the barn door handles are the same size.. then we'd be onto something. Maybe rally can put his car up on TALL jackstands and take a pic.
According to (this autoblog article) 72" width, 62.9" height, 102.6" wheelbase. I don't see a specific length but they say it is "the first MINI to measure more than four metres in length" -- so some unknown amount greater than 157.5" length. From the Clubman manual (fyi - manuals are here): 66.3" width, 56.1" height, 100.3" wheelbase and 155" length
More pictures of Crossman I think the watermarks and such show the credits just fine, no need to add the source.