20th Century Fox has picked up a pitch for an untitled sci-fi adventure project that Terminator Salvation director McG will produce and possibly direct. Deadline reports that details on the plot are scarce, but David Callaham has been hired to write the screenplay.  Callaham's previous credits include Doom and The Expendables, but I'll try not to let my negative feelings towards those films sour me on this new endeavor since I don't know how much of Callaham's script ended up on screen.If McG chooses to direct this untitled project, it will be a while before it heads into production.  While he recently wrapped on the action-romantic-comedy This Means War starring Reese Witherspoon, Chris Pine, and Tom Hardy, McG is also attached to direct the board-game movie Ouija, which is currently set for release on November 9, 2012.