Whether or not Mir will support network transparency is up to Canonical, given the features they are lacking already... im gonna guess they dont support it now, and wont for a longtime.
Wayland however supports rooted (full desktop) or rootless (single window) networking, its up to the client to decide that. And the system functions a lot like how VNC does, except better than VNC lol
Check out this video: https://www.youtube.com/watch?v=RIctzAQOe44 for a rundown of X and Wayland and how they compare / contrast. Its a long video, but definitely worth watching.