The "Plus" model is expected to come with a larger 6.5-inch display.
Additionally, with the metal back on the 6.1-inch iPhone, Apple will also be able to make it more colorful since producing various color options in glass has proven to be hard.
Looking ahead to 2018, Apple's iPhone lineup stands to become more varied than ever.
Nikkei's source further divulged that Apple is outfitting the LCD model with a metal back case - the same one used on the iPhone 7 and the iPhone 7 Plus. The source said that there was a good chance that Casetek would win orders for the LCD model, as the design may be akin to iPads, which the Pegatron subsidiary is already supplying casing for. In other words, it's entirely possible that every new iPhone model we see next year will completely abandon Touch ID in favor of Face ID. While the new handset will likely be more durable, with less glass to shatter accidentally, it may drop the ability to wirelessly charge.
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Us-based Consumer Reports recently said after an experiment that the iPhone X is inferior to other smartphones in terms of durability and battery life. Nikkei has learned that for these two handsets, Apple has chosen to use OLED screens.
Alongside this metal-backed iPhone, the source claims Apple is tentatively planning two new OLED handsets, one of which would be around 5.8 inches (like the iPhone X, which is now Apple's only OLED phone) and one of roughly 6.3 inches. Aside from that, Apple will also expand to having two OLED iPhone models next year, one with a 5.8-inch screen like the iPhone X and another one sitting at either 6.2 or 6.3-inches long.
NIkkei's report does not mention the design of the phones' front panel. While the third device would be a more budget-friendly option and will trade the OLED display for a 6.1-inch liquid-crystal display.