I would totally play as a Kelfin Shaman or Druid, the totems and forms you show look great and fit with the theme perfectly. I especially like your idea for the Balance Druid form, the fins and tail are awesome touches.
Have you given any thought recently to what the racials might be?
Some racial ideas I have are:
I really love these racial ideas. The passive fishing loot bonus I didn’t think of before. They could work well.
Glad you like them!
Besides Shaman and Druid, what other classes do you think they’d have access to?
Warrior, hunter, rogue, priest are all givens.
Shaman and druid and monk seem good.
DK of course.
These are all really good.
Every class goblins have plus druid minus tinkers if ever playable.
Not sure if I ever commented here but I LOVE GILGOBLINS AND I WANT THEM PLAYABLE.
YOU HEAR ME, BLIZZARD?! You better release these dudes during the next expansion!!!
#WeWantAquaticGoblins
I am not sure what direction they are going but in future expansions they could end up releasing them like they did dark irons. Hopefully…
Yup. I don’t lose hope still. Those Gilgoblins can bring so many interesting new concepts and lore to the game. We should all send in-game suggestions so that devs read them directly and know we want Kelfin as an AR.
Its been a while but I will post more concepts in time here.
I’m sure those will be very cool 
I have not seen much with Azshara this expansion.
I really like the glowing neck gills, I think being able to customize the color of them would be cool even if they were tied to the glow color of the eyes!
Bioluminescence is a must for Kelfin.
That looks absolutely beautiful. If blizzard made them with that kind of detail, many would love them.
Love that example!
I didn’t think about the ear design much, but I noticed the ears also have ridges.
Here’s my daily support for playable Kelfin 
I saw someone once mention they felt gilgoblins are the void elves of goblins. I believe there is actual void goblins in game. But I’ve sometimes wondered if. Lets say we assume that gilgoblins are a naturally occuring species based on some of the quotes we’ve seen. What if they originate from the old gods in some way or were goblins changed by some event aszhara did?
I suspect that gilgoblins are natural in nature.
Goblins themselves changed easily from Kajamite and a similar power may have shifted the gilgoblins into the creatures they are today. Heck it could even have just been environmental. Many natural races on Azeroth seem to be easily mutable. (trolls elves) Perhaps over time after the Sundering some goblins (or precursor to goblins) just adapted to the water.
I kinda doubt the Old God angle because Ashzara and her Naga were a result of a pact. The Gilgoblins don’t appear to have made a pact and otherwise the Old Gods affect races through the Curse of Flesh which we have no evidence of a Titanforged race matching Goblins.