IOA has literally seen 2 (3 technically counting Hogwarts Express) total additions since the park opened: High in the Sky Trolley, Forbidden Journey and aforementioned Hogwarts Express. Kong of course will come on line this year.
But the park is just lacking overall. I hardly ever find a reason to go there as a local whereas I end up at USF very often. Comcast created it's "heavy screen usage" problem by adding a ton of rides like that within the past few years, this isn't something that just happened. IOA needs additions much more than USF needs MORE additions, just non-screen ones (as much as I agree with that sentiment).