I guess you have read my X6 post here in X6 forum. X6 will have the twin-turbo V8 and dynamic-xdrive. As per rumors, the same twin-turbo V8 engine will at that time be included for X5 as welll as the dynamic xdrive. There will be some additional features as well to be shared with the X6 and probbaly V5. I will wait to see how teh X6 will be. Its supposed to be coupish shape.