Where do I get information about the changes that are included in service packs?

Service packs and release notes are available at:
http://cgi.ptvgroup.com/cgi-bin/en/traffic/visum_download.pl/

For each service pack, the release notes can be previewed (click 'view').

This document contains descriptions for:
- Significant changes
- New features
- Bugfixes

During the installation of a service pack, the file
ReleaseNotes_Visum_ENG.pdf
is copied into the folder
..\Program Files\PTV Vision\PTV Visum xx\Doc\Eng\; 9.00