I use Ubuntu 17.04. I use ssh with X11 forwarding all the time to display GUI programs running on my server locally on my computer.
Ubuntu 17.10 offers Wayland instead of X11 and I've read through a bunch of posts since 2011 about how this "might" affect X11 forwarded apps. I find many predictions of disaster, and many predictions of network transparency.
Some posts claim that I'll be forced to choose at login between X11 or Wayland. However, I have run X11 servers on both Macintosh and Windows so I don't think this is necessarily an either-or choice. But that's just more guessing. How does this actually work?