BMW has officially confirmed that the X4 off-road sports-coupe is under development. Speaking to German magazine Auto Motor und Sport, BMW CEO Norbert Reithofer stated that the X4 SAV will be slotted between the new X3 and the top-of-the-line X6 and will share the engines with the X3 crossover. The X6 has been a big success for the BMW, the sales of the off-road sports-coupe have surpassed their expectations. BMW, therefore, believes that there does exist a market for a cheaper, smaller and more fuel efficient (yes!) derivative of the X6 and hence the X4 makes a lot of sense. When produced, the BMW X4 will go against arch-rival Porsche’s upcoming compact SUV – the Cajun.