I'm on Verizon's Edge purchase program, so I'll just trade it in on the upgrade. I've decided to move to the Plus model this time, and that's a good excuse to upgrade. Really, if I had planned on staying with the smaller phone, I'd be hard pressed to mess with the upgrade since the improvements in the new model are so minimal. I could easily stay with my iPhone 6 for another year and be pretty satisfied.
I'm really wanting the Plus too this time around. Not sure if I'll do it or wait til the 7 when they can hopefully address the width by reducing bezels a little. I only like to type one handed and the sheer width of the Plus worries me.