No one knows but they are advertising it on TV so I expect it will be the ticket deal for this summer similar to the buy one adult ticket get a child ticket free deal from last year. I do want to point out that deal just disappeared a few days after people found out about the $85 ticket deal. There was no warning it would end it just disappeared and was replaced by the current deal. The only way to be 100% sure your going to get it is to just purchase the tickets because no one can tell you when its going to end.
This is not like some discount deal its the regular online ticket currently.