I'd almost certainly expect it to be called "Central Park." RCI has a history of introducing revolutionary new features on a ship and keeping the same name on subsequent classes. For example, Sovereign of the Seas introduced the soaring open atrium called "The Centrum." All of the following Sovereign, Vision, Radiance, and Quantum class ships kept this name.
The Voyager-class introduced a multi-deck main street called the "Royal Promenade." Later Voyager, Freedom, Oasis, and Quantum-class ships also had main streets called the "Royal Promenade."
Likewise, the Oasis-class introduced the open-air green space called "Central Park." I expect future classes, including Icon, that have this open-air green space will also use the "Central Park" name. (And I don't think RCI chose the name as a nod to NYC, but rather because it's a park in the center of the ship. And the connection to NYC is a bonus as these ships are like floating cities.)