Okay, Apple just let the cat out of the bag in today's financial results (live broadcast). NEW products this quarter (prior to end of year) will result in lowered margins and they also expect additional cost for increased air freight. The exact quote was something like, "lower margins based upon products that we have introduced and new products that we will introduce..." this quarter.
I too picked up on the comments surrounding air freight. Specifically the words "abnormally higher" air freight than other holiday quarters and "sorry I can't be specific about the product".
I got chills when I heard that, so it MUST mean new iMacs
Plus they're expecting lower Snow Leopard box sales for the holiday quarter. Perhaps because they'll instead be preloaded on new machines?