Mark Gurman, reporting for Bloomberg:

While core features like the combined apps platform are still on schedule to be introduced this year, some flashier changes like the redesigned home screen will likely be held back until the 2019 software update, a person familiar with the matter said. The company will also probably delay a revamped photo management application that used new algorithms to better automatically sort pictures, though some smaller upgrades to the Photos app will still appear this year.

I was really looking forward to the redesigned Homescreen.

I’m not a developer, but a combined iOS/Mac platform for third-party apps sounds a lot more complex than a redesigned arrangement of icons on the home screen.