Looks like a custom bmwnavi.eu blend.
OEM stopped at 4-1/00 (32.2).
They probably just did some
NavTweak type aesthetic mods and upped the version number while they were in there.
All of the graphics and menu text are in resource files that you can pull out of the .iso and edit, stuff back in, burn a new DVD, stick it in the drive, and bam. I changed my boot screen to the ///M logo.
To get from the OEM color scheme choices (ugly/uglier) to Day/Night, you just pull out one of the two the perspective backgrounds, invert the colors, paint a Moon and some stars on it, and put it back in. I'm pretty sure somebody did that in the NavTweak thread.