iOS 7 is already in testing since end of last year, so the reference to 6 months is kinda unreliable.
https://www.macrumors.com/2013/01/01/2013-iphone-and-ios-7-already-appearing-in-developers-logs/
6 months seems about right. By the time there is an announcement and beta, Apple has already had a feature freeze for quite a while. The roadmap was set a long time ago.