Chris Robinson, Senior Art Director at Blizzard, tweeted a pretty obvious hint of what's to come later this week in a blog post reveal on the official Warcraft site. As pictured above, it really looks like some new hair ... and where would Blizzard showcase new hair? On a new character model.
I don't think it's a very big stretch to say that another model preview is on its way. It could just be new hairstyles, however that'd seem pretty anti-climatic, especially given that we haven't seen any of the other models yet.
In fact, I'll go as far to say that this hairstyle looks like it belongs on a Human or Blood Elf (which we know are now in-progress for WoD). Stay tuned to your Warcraft news sites (especially on Twitter). Should be interesting!