https://www.techradar.com/news/sony-xperia-xz3-premium-may-have-been-spotted-with-189-screen-and-android-p

You can’t even buy the Sony Xperia XZ2 Premium yet, but we may have just seen the first evidence of the Sony Xperia XZ3 Premium and it looks like it could have an 18:9 screen.

That’s notable because so far Sony has stuck to 16:9 screens with sizeable bezels on its Xperia XZ Premium range, despite the Sony Xperia XZ2 making the move to 18:9, so it may mean Sony is changing the design in line with the XZ2.