My X5 went in for service this week and since my lease is going to be up in the fall, I spoke with the Sales Manager. He said that all BMW's will have the new iDrive in the fall including the X5. I'm leaning toward getting a 35d to replace the 4.8 - the torque is great and the difference in gas mileage is night and day.

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2012 F10 550xi Carbon black/oyster
2011 E92 M3 SSII/black
2012 W166 ML63 Steel grey/porcelain
2007 E93 monaco blue/beige (retired)
2010 E70 35d Space grey/saddle brown (retired)