It is rumoured in this article that TSMC is going to be supplying a silicon "system in package" chip for the iPhone 7. This would cut Samsung out of the manufacturing loop.
This is all assumption, so take it with a grain of salt.
http://appleinsider.com/articles/15/09/14/tsmc-rumored-to-be-exclusive-manufacturer-for-apple-a10-cpu-in-2016