I am going to need more popcorn while watching those world first races :D Exciting!
In general (heh) blizzard shows that they know how to get the mythic tuning just right. Looking at the sludgefist grind right now this makes me excited for the bosses still to come!
Good, I hear they kinda just fell over on heroic so would be a shame if they did the same on Mythic
Looks like they intend to keep them competing for the holidays :)