As you know, Apple seems to bet on three Iphone models next year – one of which says a few LCD displays. Now Nikkei writes that it can even get a back of metal. The data comes from a source "close to company product design" and the phone is also rumored to get a 6.1 inch screen. It will be sold as a cheaper alternative to the two oled-iphone that will be in 2018.
Nikkei is not the first to report on three models for 2018. Even the reputable analyst Ming-Chi Kuo has reported this, even if the phone does not have a metal back.
The site also writes that The phone comes in "several different colors" and that the chassis will be built by Casetek, a subsidiary of Pegatron.