An insider source of Ain't It Cool News has some info on the upcoming The Dark Tower project, claiming that there are "genuine plans" for a May 13th, 2013 release for the first movie, as well as "a very ambitious Game component being planned."
As you may know, Ron Howard is turning Stephen King's western/sci-fi/fantasy epic into three theatrical movies and a TV series to fill the gaps between the movies. The "Game component" is said to "further utilize elements from the books." I don't see why they wouldn't make a game for this, but let's hope that if it's true, it will be in proper hands.
There is a huge amount of material in the books -- not to mention the links to King's other books -- which would be cool to see in games to go alongside the movies and TV series. Red Dead Redemption already showed that people are ok with wandering around as a cowboy for an hour, so there's that too. An open world game set around Roland's youthful ka-tet in Mejis and the fall of Gilead? That would do just fine, thank you very much.
Regardless of how a game may end up, expect to be bombarded with The Dark Tower ads and a Susannah level without stairs somewhere around 2013.