During a Blizzcon keynote speech, Chris Metzen took the stage to announce the Warlords of Draenor expansion for World of Warcraft. It looks like you'll be traveling through time in this upcoming expansion.
"What if those dark days could come again? To forge a brighter future, sometimes you must confront the ghosts of the past."

Yes, you will get to relive some of those classic story elements from the original Warcraft series. The new expansion will take place in a new world, include upgradable player garrisons, new character models, an increased level cap to 100.

There is a trailer but it was shown only to those in attendance at Blizzcon so far. I'm sure it will be up on the Internets before you know it.