- Edited
It's a newish alternative display server protocol to X11/Xorg that is trying to solve a lot of problems that the X server protocol can't handle. Such as multi monitors with differing refresh rates on one X screen; being able to set separate DPI's per monitor; better handling of higher refresh rate monitors. Those are some of the features I'm most interested in, since I use multi monitors.
Wayland is just very slow going with development as so many Linux applications have come to depend on X11/Xorg.
As far as Windows 8.1 goes. HELL no. I hate that metro interface. I've never had any eyestrain issues with Win 10 when I have used it. I've really only used it recently to play games like Forza Horizon 4.