Please keep in mind that the below information neither comes from a completely reliable source, nor speaks of a fully developed product, as the phone is still in development. With that in mind, here is the list of features that we heard Galaxy S9 and S9+ may possess:

– phone will carry an internal designation SM-G960. While it seemingly does not matter, knowing the device’s internal name can help pinpoint it among any leaked sources,
– Android 8.0 Oreo OS with the newest Samsung Experience UI,
– fingerprint scanner placed in a centered rectangular cutout,
– Snapdragon 845 CPU, may cause delay in releasing other smartphones with his CPU.

Again, whether or not the above will turn out to be true is debatable.