My bad. I clearly need a coffee, as there was more to this article hidden below a "read more" button.
I've updated the MacRumors article with the following information.
The report claims Apple's software engineering chief Craig Federighi announced the revised plans to employees at a meeting earlier this month.
Fried says a number of features have been delayed until 2019, including a planned refresh of the home screen and in-car user interfaces, improvements to core apps like Mail, and updates to capturing, editing, and sharing photos.
While those features might be shelved until iOS 12, Apple still has a number of improvements planned this year in areas like its Health app, ARKit, and parental controls. In addition, Apple is said to be prioritizing work to make iPhones "more responsive" and "less prone to cause customer support issues."