"Production set to commence next month.
While Apple just released the iPhone 5 back in September, the firm is purportedly preparing to launch the iPhone 5S during the opening months of 2013.
The China-based Commercial Times estimates that full commercial production of the iPhone 5S will commence during 2013's quarter one. During December, the firm is expected to create between 50,000 and 100,000 units.
Due to low yield rates of the iPhone 5 on the assembly line, the paper claims that Apple has escalated plans for the smartphone's successor. Due to the fragility of the former's parts that are used to create the handset, a considerable proportion break before they're shipped."http://www.tomshardware.com/news/iPhone-5S-Apple-Smartphone-Release,19073.html
yes, just a rumor but if the past have taught me something is that almost every single rumor about apple turns to be true so if you have a 4s and you are planning to get a new iphone, wait a couple months more