The Cave has been trademarked by Double Fine. There is no information available about the title, with the exception of a statement to GameSpot that The Cave is not the game that Double Fine raised money for on Kickstarter.
Double Fine's Kickstarter became quickly famous when it broke records by making more money in 24 hours than any other project. It also had the highest number of supporters (no surprise) of any project on Kickstarter. As of this writing, the Kickstarter project has surpassed $2 million, and it's still not over yet.
Speaking of The Cave, Double Fine had this to say: "While we can't comment on unannounced projects, we can say that Double Fine's Kickstarter-funded adventure game has not been started, designed, or even imagined yet. No trademarks have been filed on its behalf."
Any ideas what the Kickstarter project might be? Let us know in the comments!