No? Wayland is available but Xorg is the default.
FreeBSD doesn't install a display server on default so the choice is yours.
There is no GUI installation of FreeBSD so I am not sure what "linux parts" you are referring to. The installation uses curses which is ancient and has existed since the dawn of C, Unix. Abd what FreeBSD is. Is that what your referring to?
pkg is FreeBSD's package manager.
Xorg is a fork of XFree86 which was originally The XFree86 Project, Inc. for Unix Systems, which targeted 4.4BSD.
Anything outside of the stuff required to make a graphical desktop work?
That's kinda big, no?
The original question was of interest because, outside of the desktop, Linux does have some other stuff they've cooked up. It really would be interesting if some of that other stuff had jumped the fence. I think FreeBSD is as likely to adopt smf or launchd or something as they are to adopt systemd (not very likely in any case), hence my curiosity about whether something had happened.