I watched the announcement really trying to find an excuse to upgrade. But to be honest there was not a single new feature that I really wanted and that my current iPhone 6S couldn't do. Pity.
If you are “feature-shopping”, you may want to check out Android phones, which ship with lots of gimmicks (which they call “features”). Apple is for quality - which is why you are still happy with your 6S. ;)
I am 100% sold on Apple devices in terms of quality, reliability and privacy issues. I don't think I'd buy an Android anytime soon. I just wish they had a few more exciting hardware features.