I'm not up to speed on the new stuff but I have a few predictions and maybe some of you can tell me if I am right or wrong.
What will be valuable:
-unopened first print Amiibos
This, but its not gonna be for awhile. I dont think the first print runs will be worth much more over secondary prints. The initial waves of amiibos werent especially rare (except for a few figs), it was just that scalpers bought up entire store stocks.