After much testing, we have come up with a solution that we can now run with. All rumors can be put to bed!!! This is not a theory that someone saw somebody else do...
The upgrade DVD (for the Z1 POI/maps) is the answer to all of our questions. The DVD-ROM is a part number of CNDV-700HD and the version number is 1.0. The release date is 02/2007.
I purchased this DVD from Pioneer yesterday and relunctantly installed the upgrade on my April 2007 model AVIC-Z2. No where in the documentation does it mention the Z2, so I wasn't sure if it would mess up the unit or not. I began the upgrade,