Given production of F15 will be starting somewhere in August 2013, when can we "realistically" expect DIESEL variants to start hitting showrooms and become available to order? In the past, diesels lagged gasoline engines by many months...

My lease on 2011 X5d will be ending in July 2013. If I knew I could order new 2014 X5 diesel one within say couple of months (i.e. by Oct-Nov), I would try to extend my lease by couple of months. Otherwise, I need to consider other options (buyoff current lease, get into short-term lease of 2013 X5d, other car?)

Any insight on the 2014+ X5 diesel's roadmap and availability is much appreciated!

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive