The prolific Trent Reznor is back at it. Less than two months after web-releasing the instrumental Ghosts I-IV, Nine Inch Nails sent a brand new song, titled "Discipline," to radio stations simultaneously around 2:30pm EST today. Reports say the song was just mastered yesterday. And unlike the Ghosts fare, this song actually contains Reznor on vocals. But here's where things get strange: Venturing back over to nin.com, a post dated April 21st reads "2 weeks!" This "two week" message echoes a similarly mysterious message posted in mid-February that ultimately resulted in the release of Ghosts I-IV. Does Reznor have another new album up his sleeve to accompany "Discipline?" We'll find out in thirteen days.