This has been pretty well known for months, especially when the CEO of TSMC said Samsung would outship them this year, but they would outship Samsung in FinFets next year.
Also, there had to be a reason for GloFo installing FinFet equipment this year, when AMD will not be using it until 2016. So, I'd expect them to be shipping some of those A9's, as Samsung will not have capacity to do so, with their own devices being made there too.
The reason is simple, Samsung had their version out sooner. TSMC is still not shipping 16FF+, and Apple didn't have time to wait.
This has nothing to do with one generation on one company, the other at another. It's just that Samsung's 14nm LPE is out, TSMC's was a few quarters later.
The A9X will be built at TSMC, however, which will go into the iPad.