CUV = Closeted Utility Vehicle? 
Just what we need, something else that needs to come out of a closet.

Seriously, the Crossover Utility Vehicle (as opposed to the Cute Utility Vehicle) is an attempt, I think, to better market those vehicles which tend to have options such as:
--AWD
--higher ground clearance than a regular car
--cargo areas
--look like true off road vehicles
but have:
--car type construction (uni-body,...)
--car like rides
and are aimed at a more urban clientele. That they also tend to enjoy better gas mileage than a "real" SUV is also a telling point. It really is an evolution of the AWD people/cargo hauler.