How do you know this for sure?
Multiple leaks say that the 32 and 64 gb models will be discontinued, but no mention of the 16 gb.
https://www.macrumors.com/2013/09/05/vodafone-germany-to-discontinue-3264gb-iphone-5-16gb-iphone-4s/
https://www.macrumors.com/2013/09/0...gb-and-64-gb-iphone-5-models-on-september-28/