As a shameless Classical mythology nerd who's always been bothered by nymphs being treated as their own species and a separate thing from dryads, naiads and so on, I am very happy about "nymph" being retooled as a general category for nymph types. If I'm reading this right, the nymph queens here would take the place of 1st edition's nymphs? If so, that seems like a very nice way of retconning the potential canon conflicts that would arise from nymph characters grandfathered in from 1st ed material.
I'm very curious to see what, if anything, is planned about oreads... and of course this opens the door to creating more subtypes based on different sorts of mythological nymphs -- nereids, lampads, alseids and all the rest. There's certainly no shortage.
(Honestly, the nymph-as-its-own-distinct-species thing always seemed to me to be like saying that, well, you've got chromatic dragons, and then you've got red dragons, and that these are distinct and separate, if somewhat similar, species.)