The Loop's, Jim Dalrymple has confirmed the report. Dalrymple has an excellent track record and his reports are generally taken as coming directly from Apple.
If everything goes according to these rumours then here is our prediction of the roll out for South Africa.
10 September - Media Event. iOS 7 available after the event.
20 September - iPhone 5s release in the US, UK, Australia and other countries.
13 December - iPhone 5s release in South Africa.