SunSpec posted a new team photo and new video to their Facebook page today. The caption for the video confirms that this is new footage of the car driving on September 29th, and that the old car was indeed destroyed by the fire in their workspace on August 25th.
That's an amazingly quick turnaround time, and I applaud the team for their efforts! Building a new solar car in a single month is a near-unbelievable accomplishment.
They've named the new car Phoenix, which I suppose is appropriate, if a bit unimaginative. (Oregon State did the same thing when their car self-immolated)