I have an SE I just bought in April that I'm perfectly happy with. I'm tempted by the Jet Black 7, but it's still larger than I want to carry, and doesn't really offer anything else more than I already have. I might be more tempted to upgrade if it had the dual camera, but the Plus is way too big for my needs.
That said, even if I were upgrading, I would wait at least 6 months to see how the headphone thing shakes out.
I just don't see the features being compelling enough, unless maybe I were still using an iPhone 5s, to warrant upgrading immediately. And there's a lot of disappointment over how poorly Apple handled the removal of the headphone jack. Too many kludged solutions to replace basic headphone jack functionality. This will get better as third parties address in the marketplace, but there's just not enough about the 7 to justify me trying to find work arounds to things I simply take for granted now.