I'm hopeful that even if we don't get any new hairstyles or colors along with the new skin options, that allied races won't have to wait nearly as long as Worgen and Goblins did for additional options. I'd even go so far as to say I'd expect to see allied races that can reasonably use their parent race's new options get access to those options either at launch or in 9.1 or 9.2 the latest.
Nightborne need a lot of love though, and unfortunately also need more work than just inheriting options from Night Elves. Though I think inheriting some, if not all, Night Elf skin options is a possibility for them.
But yea, the 4 skin tones that look virtually the same and 2 different hair colors have a nearly identical color do artificially inflate how many options really exist.
I mean... really? These are supposed to be 4 different options? The differences are so minuscule as to be laughable.