The above video is an Indonesian advertisement for the Next Galaxy and clearly shows a smartphone that, while looking nearly identical to the Galaxy S6 and Galaxy S6 Edge, also brings a certain feature that those devices do not have, namely water resistance.
The above ad also shows that the Galaxy S7 will have wireless charging/ Even the Galaxy S7 name was all but confirmed in the accompanying product pages and text but has since been removed. Good to see that Samsung has heeded user's requests to return the water resistance feature that set the Galaxy S5 apart from the pack. It looks doubtful if we will see removable backplates and batteries come back to the Galaxy S7 though.
Another inidication of the new Galaxy's design comes from case maker Spigen which similarly showed off what the new device will look like.
Source: The Verge