Most of the bugs that have been fixed were network-related.

Networking Fixes:

Being unable to kill zombies spawned from another client. 
Being unable to view zombie's animations when joining a server. 
Inconsistent damage being broadcast between clients.

General Improvements:

Viewmodels are more responive and don't take up as much as the screen.
Animations for Zombies now use wishvelocity values, which increases the smoothness of the animations.