In 2014, Samsung launched the Galaxy Note Edge which had a curved edge on one side of a screen and it offered variety of features. Samsung will offer a similar feature in the Galaxy S6 variant and it will be known as Galaxy S6 Edge.
The specs of this variant is believed to be same as the flagship Galaxy S6. Galaxy S6 Edge will have the same Qualcomm Snapdragon 810 chip, a 5.5in QHD screen and a 20 megapixel camera.
The Galaxy S6 Edge will have the curve on both sides of the screen instead of just one and will provide almost similar features. The slim side panels will likely have the ability to be switched on independently of the main panel, meaning that notifications will be shown on the side panels without having to switch on the main display.
Along with this, can put shortcuts on it or even the Twitter feed. It can also act like a virtual desktop, allowing you to switch quickly between several screens.