In previous week Apple presented iOS 12 in developer beta 5 version. Some people noticed interesting information hidden in code of this update. Apple unintentionally revealed part of information about future look of one from upcoming iPhones - it seems that the most powerful version from devices which will be released in this year will have dual-SIM feature.
It is worth mentioning that developer beta versions of previous iOS also published some information about upcoming changes. iOS 11 in beta build published information about upcoming Face ID feature and Animojis, and firmware of HomePod published screen design of iPhone X. For more information we have to wait until September when Apple will probably present all new three iPhones.