Ghostwire will no longer be published by Majesco. A representative for the publisher informed Joystiq that the game, which was supposed to be out this quarter, was removed from the release schedule over the summer; though apparently, Ghostwire wasn't publicly dropped until recently, as GameFly just sent out notices that the title was "canceled by its publisher."
The game's website still notes Majesco as the publisher, and there hasn't been an update to the game's Twitter or Facebook account in quite some time. We're currently following up with developer A Different Game to find out if it's found a new publisher for the title, and if and when Ghostwire is now expected for release.
[Thanks, Sam C.]