The biggest obstacle I see left (obstacles meaning longer term construction left), is finishing the Volcano, and I'm confident they will have it done in time. It looks like most buildings are done and need only to be finished on the inside (which we can't see), and any painting/theming (sorry in advance
@epcyclopedia for the term) on those buildings. Walkways / landscaping could happen within weeks for the entire property. A few slides / play areas are left, but those are pre-fabricated and are basically giant lego sets.