IntelliHeath
As in "Heathcliff"
That would kind of imply that the NX port has no new characters they could make Amiibo of. I don't see that.
Well, it's not necessary to think that way because they could release those 3 characters with some new characters as a new huge wave. It's something that they haven't done for awhile, and it would encourage NX buyers to pick up those Amiibo and Smash NX.
Edited: I still think that those three amiibo are going to be out before NX. It's my gut telling me that.