These are the changes since the beta 2 release:   
   Many bug fixes and minor changes (50+).   
   Added a cvar to allow zombies to pick up weapons at the end of the round.   
   Added scream and moan commands for zombies, with spam protection.   
   Added cvar to enable suicide intercept before the first zombie.   
   Added cvar for minimum dx level on overlays.   
   Added validation error messages for individual attributes when loading classes. Easier than reading bits from a number.   
   Added external plugin API for ZR with basic infection, respawn and class tools.   
   Added improved random number generator from SMLIB. (Better random zombie selection, etc.)   
   Added infection countdown.   
   Added cvar for disabling team balancing on round end (when using a custom team balancing plugin).   
   Added knock back boost workaround for CS: GO.   
   Added immunity modes.   
   Added infection modes.   
   Changed class limit to 64 classes.   
Changed Zombie:Reloaded to use the SDK Hooks extension instead of our old ZR Tools extension.