We heard about a spring/summer 2006 facelift introduction.
Official announcement could be even end of this year or early 2006.
I doubt the Cayenne Turbo power figure, I heard something around 470 but the V6 seems to be one of the models which gets more power. The 360 HP claim for the "S" sound OK to me too, it could be even slightly more.
We don't have many details about the changes, we heard something about lighter doors and other weight "enhancements", reducing the overall weight on the Turbo for example by almost 80-100 kg. We also heard about the new frontlight assembly, smaller air inlets, improved aerodynamics, slightly lower fuel consumption especially on the Turbo, LED rear lights and some other minor changes.
Right now Weissach is almost like Fort Knox, a lot of things are going in but almost nothing comes out.