Hum... I'm think that you are going to Brazil by Tam... It has a lot of green (the Amazon forest) and Rio de Janeiro is a city in Brazil... Ahh, and my guess is that the Manta relates to the new rollercoaster in Hopi Hari... It won't break any world records, but it will be the headliner of the park.
I'm not sure of what I think about this, cause it is a classic, and it could be left in it's original form for the next generations, but a GCI re-tracking will make the ride actually better!
Sea World, Aquatica and Busch Gardens! Cheetah hunt is kind of fun, but Gwazi isn't so smooth (for me). But Disney is much more magical... But, as you said, it's better to wait to the opening of Fantasialand, with Cinderella's coaster!