My mind is blown after going through the Blizzcon Warlords of Draenor panels, Q/A, The adventure continues panel and so forth. What I really like about this expansion is that we get to see the orcs that defined the history of Azzeroth. There is so much history and lore to explore in this expansion, I just wish I have the time to play this expansion or at least read about the events that unfold. Just to mention a few of the Warlords below
Grom that drank the blood of Mannoroth, how will he react to Thrall and his horde
Your future Lich king, how was he back then.
Thrall's dad back then, the father that Thrall never knew and now he has to deal with him
and finally Guldan, the same guy whose powers Illidan stole to give him demonic powers. He was also one of the first Warlocks and it was he who contacted the Burning Legion and made a deal to corrupt the orcs. Notice that Guldan is green in color as he was already drank some of the blood and is corrupted.