Talk of a BMW X4 tweener crossover to fit between the X3 and x6 has been around for at least five years now, but things are finally starting to solidify. According to a new report, BMW CEO Norbert Reithofer has confirmed the X4 is coming.

Speaking with Germany's Auto Motor und Sport, the BMW boss said the X4 would be positioned above the X3 and modeled after the X6's coupe-like silhouette. Accordingly, it'll have significantly less cargo space than the X3 it will share its platform and engine range with--about 500 liters (17.6 cubic feet) less. That's about 50 percent less space with the seats up and 25 percent less space with the seats down.

It will also get all-wheel drive, automatic stop-start, a heads-up display, and voice control.

Sharing engines with the X3 will mean, for U.S. buyers, two engine choices: the current N55 3.0-liter twin-scroll turbocharged inline six-cylinder rated at 300 horsepower, and, likely, a four-cylinder turbo 2.0-liter engine like that found in the 2012 Z4 sDrive28i and slated for the X1. The four-pot turbo has also been rumored for the X3 and 3-Series.

There's no timeline for the X4's arrival yet, but given that we haven't seen any spy shots of the vehicle, it'd be a surprise to see it on the road before 2014.