What I like best about the new version is the new interface. It's much leaner and less cluttered than it used to be and provides a good overview over the different features and security settings. The new rootkit-protection runs reliably and removes all debateable entries from the registry during the installation process.
Easy to keep track - I like the good overview/control center that Norton Antivirus offers me; it's been updated from the previous version and now give me full control over configuration etc. The new rootkit-protection is running smoothly and has removed all questionable entries from the registry.