According to an email we received from DreamCatcher Games, a third demo of Painkiller will be released next week (the 12th). The demo will include the "Military Base" level, and features the upgraded version of the PAIN engine found in the Battle out of Hell expansion pack - "players will enjoy effects such as heat and haze distortion, light blooms, per pixel specular mapping, new shader effects and tweaks for the latest video cards".