Apparently BMW have confirmed their plans to build an X4. As its name suggests, it will slot right in between the X3 and the X5 or become the bigger brother to the X3 just like the X6 is to the X5. Apparently, they are likely to produce a high-output X4M which could be awesome… Other than that version, I think they are setting themselves up for a disappointment. There really is no need for an in-between X3 and X5. You wither take the smaller or the bigger.