"The most likely reason for the delay is exactly what Apple have said, they have trouble wrapping them.
When you design a new product, the most overlooked thing is the packaging, and the 15" Unibody's got new, much smaller boxes than the old 15" MBP's, so it stands to say the 17" ones will have as well. "
Could it be the delay is due to the number of glossy and matte displays ordered? I ordered a matte display. It seems the longest shipping delays are for the glossy.
I have a new ship date of Feb 27 (old date was Feb 20). I ordered Jan 7.
Pure spectulation on my part!