In the latest version:
Weather effects (rain, thunder, lightning)
A weapon editor! (Very simple atm)
Dialogues have been improved ( variables can beshown in dialogues, you can link to another dialogue in a dialogue)
Hud shows the number of kills
Friendly AI now DROP WEAPONS!
Weapon info filesadded to some weapons (shown when picked up)
Config file has been commented
Documentation has been improved
More effects (you can set zombies on fire, smoke on projectile impact, tinitus effect if standing to close to explosion, FOG
Footsteps bug fixed
Added another firing mode (grenade launcher. It's at a very early stage)
You cannot change weapons when dialogue is active. I know, it's very anoying. That will be fixed soon.
Friendly ai sometimes fire at boomers that are close to you or others even though they shouldn't.