Wondering the same thing. We're in the DC area, waiting for a custom order to come in next month. Not a true custom order, but rather we put a few hundred bucks down and the dealer let us reconfigure a unit that was already on order, and we get the right of first refusal when it arrives. The idea being that no config is really "better" than any other. It's all pretty random, as far as I can tell, and they know they're going to sell it quickly no matter the specs.
But here's the thing...that dealer and all the others around here all say the same thing. They can't keep them on the lot. And in fact, the few that we've test driven have indeed sold within 24 hours of us leaving. And we haven't seen a single one on the road. I think I've seen maybe one XC40 around here ever, and it was probably 7 months ago, before we started considering them.
A couple weeks ago, I had to go out to SF for work. I expected to see them everywhere. I saw two. TWO, in 7 days. One in Nob Hill and another in Marin.