It's interesting that the question implies that Linux is leading the charge in defining new APIs. Everything listed has a FreeBSD equivalent that predates the linux version:
cgroups -> jails
udev -> devfs
fanotify, timerfd, signalfd -> kqueue
Of course, the Linux developers decided to reinvent them all making compatibility impossible. I guess you could argue that the Linux versions offer some extra features over the FreeBSD versions, but from a user and developer perspective, the FreeBSD versions seem more complete and stable (see jails vs cgroups).