^My thought is that since we know this is themed to rays in some type of way, we'll have some sort of safe, up close experience with the tank (though a little bit more time to see the animals than we had with Dolphin Plunge at Aquatica).
If the environment is directly based on Manta Rays, it will need a new "habitat" for the new animals, but if they stick with stingrays, then they could get rid of the Key West exhibit and use that space for something new as well.
I heard about different people getting surveyed about Manta several months ago, even being shown concept art of the attraction. A launch is possible with a B&M, it just isn't something the company likes to do for themselves. Universal needed an outside contractor for the launch mechanism on the Hulk if I remember correctly.
In my mind, I'm hoping for a Mummy-type experience with show scenes and a finale with some good coaster elements (inverted or not). I could be very off though, considering how vague the article was with details.
Change the scheme, Alter the mood! Electrify the boys and girls if you would be so kind!