If the latest report by The Bell is to be believed then Samsung has already placed orders for next year's flagship panels with their display division; Samsung Display. In addition to the 5.8-inch and 6.2-inch QHD+ panels for the Galaxy S9 and Galaxy S9+, The Bell reports that 6.3-inch QHD+ panels are also going into production in the future for the Galaxy Note 9! Of course, it's just a rumor at this point, but this does mean a couple of things if it turns out to be true. Firstly, we are not going to see a 4K display like the one on the Xperia XZ Premium on any Samsung smartphone in the near future and secondly, Samsung is sticking with the 18.5:9 aspect ratio.
Additionally, the report also states that the Galaxy S9 and S9+ will feature the elusive fingerprint scanner which is not even going to make it onto the iPhone 8 this year. It would be interesting to see how much of this actually turns out to be true, although it's going to be a long wait from now for things to become more obvious.