The X Window System (aka X.Org or X11) has been the default window system in many distros. Recently there has been a new window system called Wayland, so the joke would be that Debian is dropping X11 and switching to Wayland.

TL;DR: More colors.

Though that is a gross oversimplification of it.

Jenkins says there are already three Popeye slasher flicks in the works.

Filmmakers Try To Use Public Domain Characters for Anything Other Than Cheap Horror Movies Challenge (IMPOSSIBLE)

Meet the new boss, same as the old boss.