Earlier this week, the US Department of Transportation announced its plans to make it mandatory to register drones, even for recreational usage. There is a workgroup that will meet on November 20th in DC that will hopefully hash out the details to allow laws to go into place around mid-December.
I believe that this will take longer than just December, as it is exceptionally difficult to develop and agree upon a pragmatic approach to registration, and ultimately identification of drones and their operators.
Check out A Drone and Droneward for more information on drones, as well as updates, and be sure to head on over to FAA.gov/UAS.