Well, now that they killed the Triceratops attraction, there's that space. There's also room to build opposite the Discovery Center, which would be a more likely spot for a new E-Ticket ride.
They need more rides in Marvel and Toon Lagoon. I think they should make a avenger ride or Daredevil in the Marvel area, and you could have something like "Peabody and Shermans History lesson" where you go back in time. It could be a simulator or something.