I know this is an old bump but I had some thoughts as to why its listed as "4th Q"
5'er will switch in september 2011. That means that the new engine will be ready for mass production in september 2011. engines are likely assembled in Germany where the 5 series is assembled. So the engine will be where the car is.
The X3 is assembled in South Carolina. The engines have to get to the U.S., clear customs, and get ready to go in the X3. There may be some delay and they can't predict exactly when they will make the switchover.
That is my theory.
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