It may just be a matter of shipment availability and retail restocking considerations, but Amazon is now listing FUNimation’s upcoming Dragon Ball Z “Dragon Box” volume one as coming out on 17 November 2009, a delay of exactly one week. In addition, my own e-mail update from Amazon stated:

Unfortunately, the release date for the item(s) listed below has changed, and we need to provide you with a new delivery estimate based on the new release date:

“Dragon Ball Z: Dragon Box One”
Estimated arrival date: December 02 2009 – December 08 2009

We are waiting on some additional confirmation, but it looks like shipments may be coming in at least one week later than previously planned.