Just wondering if anyone has any insight as to if/when they will be putting the Twin Turbo 6 motor into the X5?

I ordered a 4.8 and a 3.0 with identical configurations but now with the $2500 factory rebate the 3.0 is much more attractive financially. But I am suspicious that the reason for the incentive on the 3.0 is that the TT will be released right away.

It would seem logical that since the Z4 and X6 both have the TT 6cyl, that from a supply chain perspective it would not make a lot of sense to have a separate 6cyl motor specifically for the X5 (since all three autos are assembled in SC).

Anyone have any insight into this?

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Current Cars:

2008 X5 4.8i - Blk/Saddle
2001 330Ci - Titanium/Black Sport/Premium

Past Cars:
1993 325is Blk/Blk Sport
1995 M3 Blk/Blk
1997 328iC Blk/Blk Sport/Premium
1998 M3 Silver/Black
2001 M5 /Black/Black/Sport
2005 X5 3.0i - Blk/Blk Sport/Premium