SpaceX says [spacex.com]:
We are finalizing the investigation into our September 1 anomaly and are working to complete the final steps necessary to safely and reliably return to flight, now in early January with the launch of Iridium-1. This allows for additional time to close-out vehicle preparations and complete extended testing to help ensure the highest possible level of mission assurance prior to launch.
This may be optimistic [wired.com]:
"They have not completed their investigation and therefore they do not have an (FAA launch) license," said an FAA spokesperson. The FAA said the time it would take to grant a license to SpaceX depends on how big a fix they propose to address the cause of the fire; SpaceX has previously said they believe the problem lies with helium in the liquid oxygen propellant tank. The accident occurred two days before the flight's scheduled liftoff.
Also at Reuters [reuters.com] and Space.com [space.com].