FOSDEM: The Wayland display server

I would think that the toolkits would also be able to use the local D-Bus sessions, ssh-agent sockets, etc. instead of also having to forward those in addition to the X session socket (or just leaving it as-is and always hooking up to the remote one).

You could have automatic gvfs and KIO slaves made for wayland-local:/ and wayland-remote:/ protocols so that the local and the remote filesystems could be accessed. There's a lot more than just pushing pixels across a pipe to get the full experience of running a remote application as if it were local.