In yesterday's Penny Arcade post, Tycho announced that the first round of DLC for the PC and Xbox 360 RPG was on the way. He hinted that the next installment of On the Rain-Slick Precipice of Darkness 3 might be released around the time of PAX Prime next month.
The new chapter is called "The Lair of the Seamstressand is the penultimate DLC release which will be followed by another free release being developed by indie game developer Zeboyd Games, the indie studio behind Cthulhu Saves the World. This last DLC release will "[detail] the fate of the player character from the first two games."
According to Tycho, Zeboyd is also working on Episode 4.
[Source: Penny Arcade via Eurogamer]