Its not, from what I have been reading its the 6s without the 3d touch in the 5 / 5S shell. Perfect (well almost) for what I want.
The best phone Apple made was the 4S. If I could have the 4S with 6S internals, thumb print scanner (apple pay etc) and updated shatter proof glass that would be perfect. I used my dads a bit this weekend and its still a great phone however ios9 kills it compared to how ios6 ran on it.