Yenniku is described as the youngest son of Vol'jin, implying that Vol'jin has multiple (or at the very least two children). I'm bringing this up because Blizzard has the opportunity to introduce a potentially new troll character that could (through progression) rise up to be a new Chieftain of the Darkspears.Yenniku is Vol'jin's youngest son. As is a custom with jungle trolls, he was given to the Gurubashi tribe of Zul'Gurub. However, he was lost to the Darkspear tribe after they left with Thrall. He was later captured by Zanzil the Outcast, who had taken control of his body and mind and sent him to the Skullsplitter tribe to make them join him.
Alternatively, if Blizz ever introduced racial campaigns, they could introduce multiple children of Vol'jin that could all fight for the status of Chieftain, causing a divide amongst thr Darkspears and possibly even pulling in other jungle troll tribes like the Horde-aligned Shatterspear.
I personally find it interesting as a concept, even though I'm at least 99% sure that Blizz has either forgotten or just doesn't give a shit. What do you think?