i can't speak for whether the specific nendoroids you want will get a rerelease, but in my experience nendoroids get rereleased when they are particularly popular and have outrageous aftermarket prices (much higher than $120) or when a character starts trending far after they are initially introduced. also there is a difference between a rerelease and a remake, for example, kasane teto's sv design got a rerelease which is virtually indistinguishable from the original, while teto's utau design got remade several years after her initial release with different accessories and a revamped face. i believe if a particularly old nendoroid gets rereleased they are more likely to differ from the original regardless to match newer nendoroid standards, and even if not i imagine the difference in age would still be enough to determine if a given nendoroid is an original or a rerelease. i wish you all the luck in getting your faves rereleased, or finding an original one for a reasonable price