Will we ever have world events like this again?

World events have happened several times throughout the history of the game, and all of them have been quite different from one another. More world events will surely happen again in the future, and those events will likely also be different from what we have seen before... Will the future hold a world event akin to the Gates of Ahn'Qiraj, well that is hard to predict really, but it can't be completely ruled out if it would make sense to run such an event at some time in the future.

This leads to a few interesting questions actually, questions that I am sure you guys would have many different answers for: If we were ever to have another event like the Gates of Ahn'Qiraj, where would this event happen? What should happen during the event? What would be the lore behind the event?