The Fun Pimps have released A19 B157 Experimental to the public.

Changelog can be found here.

Some highlights:

• Linear Color Space Lighting
• Interactive Loading Screen
• Improved Game-pad Support
• New Survival System & Critical Injuries
• Food and Water Bars
• HD Characters
• Dynamic Music System
• Loot Progression/Balance
  • Tech 0 (GS 1-11) – Primitive tools, weapons and armor including a bow and the blunderbuss.
  • Tech 1 (GS 12) – Iron or similar melee items and armor and and the first proper firearms like a pistol or double barrel shotgun.
  • Tech 2 (GS 50) – The best melee items, bows and armor and mid range firearms like a pump-action shotgun.
  • Tech 3 (GS 91) – The most advanced firearms like an M60 or the Sniper Rifle.
• Enemy Progression/Balance
• On Screen Sprite System
• Quest Improvements
• World and Location updates
• New Weapons & Items
• New Candy
• New Perk Books
• Perk Balance
• AI Improvements
• Random Gen Improvements
• Animation Improvements
• Dynamic Resolution
• Server administration and multiplayer
  • config changes, console commands, etc
• Audio Improvements
• Analytics and Telemetry