Hollywood studios have a habit of announcing big, ambitious projects only to then send them into limbo. We thought we'd check in on the status of a few long-promised films. Whether it's an anticipated sequel ("Ghostbusters 3," "Kill Bill Vol. 3"), an adaptation of popular source material ("The Flash," "Ant-Man"), a TV transfer ("24," "Arrested Development") or a remake ("Logan's Run," "Akira"), there are dozens -- if not hundreds -- of titles that could appear on this list. We've narrowed it down to 20. Are you holding your breath for any of these films? Or is it time to move on? Sound off in the comments section. 

Check out our list below: