You'll find a few more changes than just the 3 mentioned earlier. One big change is the Application Catalog, replacing the separate Workflow and ConflictSolver databases. ConflictSolver alone has a number of changes, including the persistence of Conflict data for easier management of conflicts/resolutions. ConflictSolver now lets you import the entire MSI, including custom tables, and bulk import is also available. It also lets you create/display additional info you'd like to track for each package - extended attributes.
I've only really discussed changes to ConflictSolver here, because it's near and dear to my heart. There are lots more goodies throughout the product. WSE conversion, Users/Permissions, LOTS of other things. I'm sure the Marketing folks have made a better 5.0 features/changes list than I could ever write, and they'd love it if you went to
www.installshield.com/isas to check it out.