Here is the list of new features and improvements from the release notes:
New Features

Support for markers.
Added the ability to manipulate cuts/crossfades.
Automatically restore the session after a crash.
Drag and dropping the selection.
Play through when recording.
Saving the color scheme presets.

Fixes and Improvements

Wave64 support was broken on 10.4/intel.
Ability to zoom when command dragging the overview window.

Support [...]