BMW is currently developing a F5 / V5 based on the upcoming F10 5-series. It's best described as an MPV, but unlike the current Touring models the new cars will feature a taller ride-height and high roof to maximize interior space.
In these photos we can now see the exposed grill, including slats. Like the new F01 7-series, the F01 5-series clearly looks to have significantly larger kidney grills up front.