Eh, it just means that the term Fey is going to expand to mean anything the designers want. Theoretically Cthulhu could be included as a fey since Eldritch comes from the middle-English elfriche, or 'of the elven kingdom.'
At start kobolds, goblins, orcs, and hobgoblins were just the 1/2, 1D-1, 1, and 1D+1 HD versions of effectively the same* thing**. (.....)But in the end, no, orcs and bugbears were mostly differentiated by the bugbears having more HD, and the occasional depiction as being ambushers. *I guess kobolds 1 worse and hobgoblins 1 better AC also distinguishes
**Bugbears coming out in Supplement I and being 3+1 HD and getting 2-8 damage instead of 1-6 gives them a clear difference, but one created by the change in how the game worked midway through.
I would love a more mundane Barghest (not shape-changing, not graduating back to the outer planes after consuming enough souls). They'd be a perfect Fourth Gobinoid. I'd want to see something like that in action, in literature or in an adventure to get a feel for them, though.
..and the aquatic half-octopus goblins, and snow versions of each. Lots of variety. But if you had to choose one, to be a "main" variety?
I've been seeing how they would hold up if they were a part of Dar (or pre-Dar) society. Mainly because the divisions between the goblinoid types are so vivid.
Maybe? (I mean RAW, yes, of course, but for me) This would be an additional, different, type of creature. Gnomes have the same kind of thing going on - you have the magical secretive keebler elves of the forest, and the technological tinkerer inventors. Two completely separare creatures (or at least societies) with nothing really in common except for the name gnome. Same with fey goblins and regular goblins.
I guess I'll eventually have to deal with the same bifurcation of post-warcraft-type Orcs and Cubicle 7 Tolkien Orcs of the Shadow. But I guess that's off topic.