There are lots of rumours, and it is a logical change for the E70 as the torque curve makes a lot of sense for the heavier X5.

I haven't seen any dates yet, but the X3 may be first, given that the high output diesel is now offered in Europe.

It may be offered when the high output V8 is made available, in late 2007 or 2008 (all dates are just guesses until we see an official release).

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue