Although all Galaxy A handsets released so far use a touchscreen display with a conventional aspect ratio of 16:9, the screen of the upcoming Galaxy A5 (2018) will use the same 18.5:9 ratio as the Galaxy S8 flagship.
https://www.notebookcheck.net/Samsung-Galaxy-A5-2018-spotted-online-with-an-18-5-9-display.262808.0.html