If you've been wondering, like I have, how the Iron Horde changed the destiny of the alternate Draenor we find ourselves journeying to, then Blizzard is finally doling out some of that information. Gul'dan and the Stranger, a comic downloadable directly and at now cost from Blizzard, has some of those answers for you. Micky Neilson, the author of the comic, assures us that each following issue will also be free to download, so you can read each issue and see what happened to make the Iron Horde a reality, and how the most evil warlock in creation reacted to these events. Man, sometimes it's hard not to spoil things.
The art's by Alex Horley and it looks pretty awesome. I recommend checking it out.