The BMW Dealer here in New Zealand are saying that all 4.4 X5s will now be getting the 4.8 motor prior to the realease of the new X5 next year.
New X5 petrol versions sales here in New Zealand has been very slow. Mainly due to the increase of fuel prices here. On the other hand sales for the diesels are very strong.
Prices here in New Zealand for cars are very expensive compared to the rest of the world.

ie a new 2006 x5 4.8is retails for $185,000k 4.4 is $148,000k the new M5 is over $250,000k and this is in New Zealand dollars a lot more when converted to US Dollar.

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2002 X5 3.0d sportpack with 160kw