Dimensions aside, the S8 fairly identically clones the look of the S8+. Features include:

Speaker grille and microphone hole

USB-C charging port and headphone jack (Apple: 0 Samsung: 1)

Pulse reader/flash assembly

Rear-facing camera

Fingerprint reader

The S8 is a safe evolution on the S7 Edge—proportions, camera and sensor package location, and size are all fairly on par.