Wayland. It comes up a lot: “Bug X fixed in the Plasma Wayland session.” “The Plasma Wayland session has now gained support for feature Y.” And it’s in the news quite …
Might be the reason I switch from Fedora to OpenSUSE. While it solves problems for some, it's not ready for others. One of the few (legit) reasons to use Linux is the dynamic tiling window managers. -Wayland (atm) takes away that reason.
AFAIK, it just came out of 'early development', and I haven't seen any publicity on it since. It's also only supported by a few distros. -Fedora isn't one, and considering it's one of the distros that's pushing hard on Wayland.