They'll do amibos for pearl and marina. Either as a 2 set or on their own. They did the ones for Callie and Marie when t was near the final Splatfest, so they might do the same thing, or release them earlier.
Honestly, I'll most likely end up getting the Marina amiibo, but if they'll come only in a 2 set then I might end up keeping the Pearl one as well.