In October there was an accident, where the first rocket was destroyed. Virgin Galactic had already that time the second rocket under construction. They have worked in three shifts to get the rocket ready as soon as possible.

More info: http://www.virgingalactic.com/mojave-update-spaceshiptwo-construction/

You can see the current situation in the picture. It will take some months until the second rocket will fly.

Picture: Virgin Galactic