A hands-on image of the upcoming Apple Watch Series 4 has leaked showing a slightly larger edge-to-edge display with rounded corners. The resolution of this display is expected to be around 384 x 480 pixels, which allows for a higher information density than the Watch Series 3.
https://www.notebookcheck.net/First-hands-on-picture-of-the-Apple-Watch-Series-4-shows-off-its-edge-to-edge-display.329026.0.html