According to Macotakara, a Chinese source has reported that Foxconn and Pegatron have begun assembling the iPhone 5 in preparation for an early October launch in the US and a late October launch for Asia. Timescales for other territories are not mentioned.
The report also claims that the units, once assembled, are not being boxed up. This is because Apple is not ready to install iOS 5 on them yet, so presumably this will happen at a later date.
We heard back in early August that Apple had ordered 10 million iPhone 5s from Pegatron and that the company would begin shipping them to Apple in September, which fits in with the latest reports. A photograph taken at a plant belonging to Wintek in mid-August was claimed to show an iPhone 5 production line.
Components for the iPhone 5 went into production in July, Digitimes reported, and since then there have been several mystery components that could be for the iPhone 5 or perhaps an iPhone 4S spotted in circulation.