I just called Bill M. at the CARB. He told me that they are working on the X5 diesel cert. right now, however, he would not give me a timeline. He mentioned he sits next to the guy that certifies all the BMW's.

All CARB contacts are in this site: about half way down the page.
On-Road New Vehicle & Engine Certification Program

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2008 AW E90 M3
2011 AW E70 X5 35d
2005 JB E46 M3 - SOLD
2009 BB A5 - SOLD
2007 AW 335i - SOLD