The orginal article that I read, speculated that the engine would be the same as the one in the new M5 (S63Tu from the new M5/M6 vs the s63 that the present generation uses) and also the M version of the F15 X5 will show up earlier than the usual wait time after a new model is released.....

There was also mention that the front grills will be bigger and that the front headlights will blend into the grills like the new 3 series.

Anyways interesting to follow its progress..