In this video I compiled all of WoD's cutscenes in chronological order, ad-free, for your viewing pleasure!
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The expansion is set after the events of World of Warcraft: Mists of Pandaria and takes place on the world of Draenor, the original homeworld of the orcs, prior to its destruction and the creation of Outland. Legendary characters of Warcraft's past, such as Grom Hellscream, Ner'zhul and Blackhand, make appearances.
At the end of Mists of Pandaria, Garrosh Hellscream is overthrown as Warchief of the Horde by the combined Alliance-Horde forces and taken into custody by Taran Zhu so that he can stand trial for the atrocities he committed in Pandaria. However, before he can be judged, Garrosh escapes captivity and, with the aid of a mysterious ally named Kairozdormu, travels back in time to the orcish homeworld of Draenor prior to the rise of the Horde. He creates an alternate timeline by preventing the orcish clans from drinking the blood of the demon lord Mannoroth, which led to their corruption by the Burning Legion and played a major role in the events of the first three games. The clans unite into an "Iron Horde", using technology Garrosh brought from his time, and begin a war of conquest on Draenor, building a Dark Portal that would allow them to travel through time and lay siege to Azeroth of the present era. (source: :_Warlords_of_Draenor)