updated 09:32 am EDT, Wed August 21, 2013
Fits in with recent rumors
Apple will ship the high-end iPhone 5S and the mid-tier iPhone 5C to Japan on September 20, says local business publication Nikkei. The site moreover backs numerous recent reports that the 5S will have a gold color option, although it's still uncertain how it will fit in or replace current slate and silver models. In terms of carrier support, it's believed that SoftBank and KDDI will carry both new phones at launch, once again leaving NTT DoCoMo behind.
Since Japan is usually a first-tier launch country for the iPhone, the 20th would presumably mark the launch window for the US, Canada, the UK, and several other countries as well. The date is consistent with recent rumors pegging new iPhone models to late September, following a press reveal on September 10. Somewhere in between, Apple is expected to release iOS 7 to the public.