These guys really know how to do a cinematic.
Anyway, they just announced a trilogy of expansions, starting with The War Within. I don't have a lot of time to dig right now, but I did see that the first expansion will include a new race (the Earthen, the stone golem looking guys from Northrend), and will be set mostly underground (likely with Dwarf elements.)
Announcement
The last one has me a little leery - hopefully they don't do the Blizzard thing and over-streamline it so that there's no fun to be had in playing new characters.Explore the new continent of Khaz Algar: Off the western shores of Kalimdor lies The Isle of Dorn, a new hub for both the Horde and Alliance. Begin to explore what dwells beneath the surface in the lava-fuelled forge of The Ringing Deeps, the lush Hallowfall, and the pinnacle of Nerubian society, Azj-Kahet.
New Playable Allied Race – the Earthen: Players will meet and unlock this Titan-forged race who have made Khaz Algar their home, with their own unique civilization and culture.
Expand your Warcraft fantasy with Hero Talents: A new level of class specialization customization, Hero Talents are modelled after well-known archetypes from the Warcraft universe, including Dark Ranger, Farseer, and more.
Delves: New bite-size adventures seamlessly integrated into the world, which flexibly scale to support 1-5 players, and offer meaningful progression.
Warbands: A quality-of-life feature for players with multiple characters, Warbands allow banks, reputations, transmogs, and more to be shared across all player characters.