SO nothing is confirmed YET....buuuuuut one of the brothers/creators of the fetival shared this nugget of 411:

“We get questions every week from all over the world to copy the festival elsewhere from rich Russians and Indians to promoters from Australia, the United States and South America. We’re going to do it, but on our terms, and only in places where we feel at home.” 

You can't blame them! If you've never been you can just tell from the videos that this festival doesn't mess around.

“It’s like building a city for three days on one place which has a great influence on the experience. With restaurants, bakeries and burger business. Every detail, from the napkins to the operation counts. Tomorrowland has a hight reputation to live up to and it’s a damn difficult job. We want to do well, so we do not want to have any deadlines yet.” -Manu Beers