You are right, that is a huge gap. And I can bet that there will still be when Heavensward is released.
Just think about it, what ilvl did you have when you made it to lvl 50? And if Heavensward will let you continue to lvl 60 I can't imagine that they want you to stay on lvl 50 content to grind ilvl to 115+ before being able to enjoy the new content.
