I think its safe for us to assume that unless the rights holders themselves refuse to allow Universal to renegotiate, we can assume most if not everything that was meant to come in 2020 will return. Its gotta be way cheaper to renegotiate agreements than it is to buy new licenses and build new mazes from the ground up.
Also, I'm really curious if most of the Beetlejuice room was meant to be used in there from the start, or how much of it was props meant for the maze that they just decided to move for now.