There are 6 major changes in WR 8.0:
- New Function Viewer for Managing Loaded Compiled Modules and Functions
- Enhanced Test Parameter Model
- New Background Image Option
- Improved Configure Class Dialog Box Design
- New Printing Options in Unified Report View
- Enhanced Environment Support
This information was copied from the "What's new"-page in the online help, you'll find more details there. And Mercury's sales department will surely help you getting much more information than that - have you asked them yet...?