I know, another xpac thread. But we all the talk about "Warlords of Draenor" and "time-traveling" we forgot about the biggest hint of them all, the character scaling instance mechanic called "Timewalker".
Why call it Timewalker, the name of a time travelers faction that made their first appearance on the Card Game and then on the Timeless Island? Why spread the Timewalker name and concept like this? My honest opinion is that Blizzard was seeding lore for the next expansion.
Being it Warlords of Draenor or not (remember, the name was leaked before the trademark together with the travel-traveling plot, plus the chinese leak), the next xpac will have time traveling in some from as the main theme, or else they wouldn't call "Timewalker" to a scaling mechanic.