https://www.cnbc.com/2018/08/03/iphone-x-plus-appears-in-ios-12-beta.html

An icon that appears to represent an unannounced larger model of Apple iPhone X was spotted inside Apple's latest iOS 12 beta. It was first spotted by an iOS developer who posted pictures on Twitter.

It may not seem like much at first -- we're just looking at icons, after all -- but Apple's software has revealed the company's product launch intentions in the past. The HomePod smart speaker and the iPhone X first appeared in early software releases before they were unveiled to the public, for example.