I
It could be a lot of things now couldn't it. Do we even know what the S in 5S stood for? Slim, speedy, sleek.
Okay, maybe those were a little off. But you get what I mean..
I don't think we should worry about that just quite yet though. We'll cross that bridge when we come to it.
The S in 5S stood for security, 4S was Siri, 3GS was speed. As for the iPhone 6S no one will know until the keynote for it.
not slightly ahead! lol