A while back Chris Metzen did say that as far as Warcraft 4 is concerned, the game may be an alternative timeline in which certain events did or did not happen. That way they can bypass the whole process of having to retcon WoW lore itself.
So maybe, just maybe, they took that idea and fused it with an actual WoW expansion idea?
And as for the first leak about Warlords of Draenor, it said that Grom would be the end raid boss. At first this gave me mixed feelings, however, if this is true, it would make sense in this timeline. If for some reason Garrosh is freed, what if he made his way to this alternative timeline (Infinite Dragonflight?) and help create a new Horde, an Iron Horde. For the first time in WoW we could have two endgame bosses instead of one.
In this timeline certain characters and events would be changed:
The Iron Horde eliminated every demon from Dreanor and thus, in a twist of fate, saved the planet from the Legion's influence. Because of this, the Lich King is never created, and Ner'zhul is still the orc he was, and may even be an enemy to this Iron Horde.
Neltharion may have never been corrupted...or at least not corrupted as much. He may play a significant role in the timeline in which we interact with.
Heroes of the Alliance Expedition may appear, but in this world of the Iron Horde, don't be surprised if most have been killed.
Infinite Dragonflight do still exist, in both timelines. However, in this timeline they may be a more noble race, or an even deadlier race and possibly be the reason Garrosh made his way to this timeline. Maybe their sense of peace and order is absolute chaos, and a way to bring this about is to temper with the timelines in such extreme ways that they collapse under each other and destroy the very existence of the Warcraft universe.
Alternative Timelines do exist as is proof in the Thrall: Twilight of the Aspects in which the Twilight Dragonflight try to use Blackmoore from a alternative timeline to kill Thrall.
What are your thoughts on both Metzen's talk of an alternative timeline, as well as some of the possibilities that I listed? Do any of these ideas change your initial thoughts on a alternative timeline expansion?
Note: As far as the Iron Horde is concerned, I don't believe that anything related to it are in game since Garrosh calls his Horde the True Horde