The initial batch trials are said to be 50,000-100,000 units, claim the paper's sources, with production ramping up for shipments in the first quarter of next year. Now we doubt that Apple will introduce an upgraded version of the iPhone 5 so soon after its announcement, though it already broke its typical annual upgrade cycle with the iPad 4, releasing it just half a year after the new iPad launched.
The source says Apple has been certifying different components and materials for the 5S, so that might be one more way to address yield rates. Alternatively, the 5S might be just an improved manufacturing method that addresses the scuffs and touchscreen issues, so there's no point speculating further until we have something more concrete.
The Commercial Times source also says that Apple is said to release an upgraded version of the iPad mini a quarter after it starts shipping the improved iPhone 5S, which could mean next summer.