I wait to see if the new iteration is at all exciting to me. I remember being excited by the 4, impressed with the 4S, indifferent to the 5, barely interested in the 5S. The 6 / 6 Plus was the first iPhone that got me excited since the 4.
My gut feeling I'll see the 6S as a solid move forward, but not particularly exciting.
I got my 6 in December, and I'm still 100% satisfied with it. I'm looking forward to what they do next with the 7 and 7 Plus.