Both videos appear to show screens with rounded corners instead of sharp corners, which we've recently seen on the new LG G6.
The LG G6's display has rounded corners, which could hint at what the Galaxy S8 could look like with rounded corners.
Apart from a new design, it's not clear if the rounded corners on the Galaxy S8 will have other functions. For the G6, LG claims the rounded corners makes the screen more resistant to cracking when the phone is dropped. It's a claim we're not ready to test with the pre-production test device we have. Even then, we're not even sure how rounded corners could truly make the screen more durable.
Both videos also seemingly confirm previous and popular rumors about the Galaxy S8, including narrow top and bottom borders, which allow for more screen space on the front surface. The screen on both the Galaxy S8 and Galaxy S8 Plus are said to have edge-to-edge curves, like the Galaxy S7 Edge. It seems that Samsung is ditching the flat design.
The videos also indicate that the Galaxy S8's physical home button, as well as the "back" and "recent app" buttons, have been relocated to touch buttons on the bottom of the device's screen, which we've seen on several Android devices already.
One of the shots that focus on the top of the device also seems to show an iris scanner, which could be used for unlocking the device and opening folders that warrant an extra layer of security. Iris scanners were first seen on the Galaxy Note 7.
A quick shot showing the bottom of the devices also suggest the Galaxy S8 will come with a headphone jack.
It's tempting to believe the devices in the videos are the Galaxy S8, especially since Samsung's announcement is coming up so soon, and the videos apparently confirm just about every rumor about the Galaxy S8's design.
Still, leaks and rumors aren't concrete, and we'll have to wait until March 29 for Samsung's announcement to get the official details about the Galaxy S8.
