Mainly, we can see the Infinity Display which is showcased in several renders on the devices. It has 18.5:9 aspect ratio, which is giving them premium look. There have been also several benchmark results, but they were not yet shared with us. We can only guess that the device will have FullHD 1080p screen resolution.
On the back side though, we can see that the devices will most probably have single camera system. The dual-camera system will most probably be a feature of the 2019 models of the devices. The fingerprint sensor position is on a better place than the Note ones definitely. It is right below the camera on the back side of the device.
On the sides there are the Bixby button and the volume buttons. The Bixby Button could not be available for the smallest part of the family, the Galaxy A3 (2018). Its features are still unknown.