I think the plan is to have several x-ray machines and metal detectors on the pier, and have the area between screening and the ship be a sterile area so no further screening is needed once aboard.
I'm adopting a wait-and-see approach on the Oasis. RCI knows if they blow it on managing 5400 passengers, they will have a public relations disaster on their hands. I'd hate to be the person in charge of developing the crowd-control plans. That has to be a constant headache, with the ax constantly hanging over you.