Also found this on Scrolls of Lore, thanks to Medievaldragon.
Looks like we are to see a lot more of Zol'jin, plus he is getting an upgraded model same with all the Zandalari trolls so I take this as one, a;biet small, step closer to updated player models!World of Warcraft: Vol'jin, Shadows of the Horde by Michael Stackpole will have Vol'jin and Chen Stormstout on a mission throughout Pandaria. I have a feeling there's going to be some Zandalari.
Blizzard is updating Vol'jin NPC and the Zandalari trolls in Pandaria with brand-new models in Patch 5.1.
Expect to see more of Vol'jin in Patch 5.2 as well.