There was also a minor fix to gunnery relating to where tracers appear. So that's one reason. For myself, I'm an ardent beta tester - I can break stuff good - so I would download anyway just to help out.
The glitches I've seen myself include:
- skins are no longer available
- radio can only be tuned with .radio commands
- ctd on alt-tab
- sky texture tearing on some terrains