On the 22nd February, Double Fine registered a trademark for "The Cave", which has instantly brought up speculation that this will be the title of the Kickstarter game currently called Double Fine Adventure.
However, it isn't necessarily the title of the Kickstarter project, as Double Fine recently stated it was going to start developing other games in a more traditional manner.
So, right now, there's no indication of whether Double Fine Adventure, which has raised $2.2M to date from donations on Kickstarter, will be eventually called The Cave yet.
Double Fine files trademark for "The Cave"
29 February 2012 | By JonahFalcon