Bale
Minion
Well it's no different from any other new feature in that regard - other than it being the last one you need to be hesitant about, of course ;-)
That's exactly why it is sooo amusing. We can cause bug reports by using a new feature designed to prevent bug reports from new features.
Of course if a script uses a new feature that is implemented after "since" was implemented, then there's really no reason to hold back.