It's basically F15 X5's nose ... slightly modified for a bit more aggressive look. Same goes for the interior - some sporty touches are added here and there. Minor things though.
Regarding X4 ... it will share the headlight design with the X3 LCI. The cluster shape will be identical to the one of X4 Concept - yet the graphics will be more conventional. Also the X4 nose will be slightly modified X3 LCI's nose - to add a bit more aggression to the looks. Interior will be an upgraded X3 interior (it will also be featured in X3 LCI).
X6 & X4 will share the basic shape / silhouette, similar rear design & the broken shoulder line above the rear wheel arch. Due to smaller dimensions the X4 looks more compact & intense, while X6 looks more elegant & upscale (cleaner less complicated lines), stretched yet still bulky due to bigger dimensions - and therefore oozing more presence. It also looks more aggressive due to pointy shark nose tip which X3/X4 does lack.
So, X4 will indeed be sort of mini X6. And that's the whole point: offering a more affordable SAC. It's actually a product for those who are suckers for SACs but can't afford (or don't need such big vehicle) an X6.
