The report does not indicate why Panamera production has been stopped – that the five-door's body is made at a separate location in Hanover, Germany. However pre-assembly will continue on these models. At full capacity, the Leipzig plant can produce about 450 vehicles per day, and it isn't clear how long this weather-related stoppage will last.
UPDATE: Bloomberg reports that production has been restarted at the plant, albeit slowly. Cayenne production has gingerly begun after the flood stoppage, and Panamera "pre-assembly" is moving forward as well.