A window assembly for a vehicle includes outer and inner window panels and a spacer element disposed therebetween to establish an interpane cavity between the inner and outer window panels. At least one of (a) the outer window panel has a larger cross dimension relative to the inner window panel to provide overhang regions, and (b) the inner window panel has a different contour or curvature than that of the outer window panel so that the interpane cavity varies in gap distance across the window assembly. A roller shade is disposed in the cavity and is electrically deployable to coil and uncoil between a coiled light transmitting condition, where the roller shade functions to substantially allow light transmission through the window assembly, and an at least partially uncoiled light attenuating condition, where the roller shade functions to at least partially attenuate light transmission through the window assembly.