I remember during Cataclysm he had a wife. Then at the end of the Dragonsoul, Alextrasza touched her belly said there was more life coming insighting she was pregnant.
Then he left to live in nagrand and tell Saurfang his family was safe.
So when we get to see that kid already? Or did Blizzard cancelled it like they did with Medan?
Shamans get to see his son in Legion at the start of the Doomhammer legendary artifact quest. Thrall and Aggra are standing by the well and their son is running circles around it.
If you watch the first 30 seconds of this video you can see him.