It definitely looks like an early
pig dragon to me, but I have no idea why it would be. The other thing it reminds me of is the
makara, but that's Indian and still not sure why it would be appearing in WoW in this context.
If we're going totally off the rails then it could be a hint at the other side of Azeroth. I'd like it if they're makara and there's an Indian-inspired culture in Avaloren unrelated to the Arathi. I could even see some naga having made their way over there and becoming more like the naga from Indian mythology. The cintamani (wish-granting stone) is often associated with both naga and makara, so these very well could be both Erinethria's brood and the wish-granting dragons that the Arathi know of.