Bit too late to build a plant for a phone coming out in a few months...?
Yep.
So, this fall 2017, iPhone 7s, in 3 sizes: 7se small, 7s medium, 7s+ large.
Next fall 2018: iPhone 8, a body redesign with new full-front OLED or Micro-LED display & hidden TouchID sensor & Kinect face recognition.