Coffee Stain Studios has just announced that next month they'll be introducing a new patch (1.1) that'll bring with it local split-screen, a new map and new playable goats.
"A lot of people have been asking for DLC with new maps for Goat Simulator, but we would feel bad charging people for DLC content when people can just download new stuff for free from the Steam Workshop, so we decided to do a free update instead," said Armin Ibrisagic.