5.2 brings new models for Farraki, Amani and Drakkari trolls. Since from among those three the Farraki currently share the same model as the Gurubashi (to which at least racially the Darkspear belong), it seems likely that this model (sans color palette) might be a sneak peak at the new troll player model.
I have to say that I like them very much. Both the desert troll and the forest troll look wonderful. The ice troll is okay, but not in the same category of quality as the other two, I think.