Since this is the last "new" episode, I expect they will wrap up storylines like crazy, including the custody battle, Nina's daughter, and the Ava/Nik marriage.
They won't leave us with ALL the storylines solved.
As the judge is ready to decide custody, Nina spies Nelle with the necklace and screams, "Oh. My. God. YOU'RE MY DAUGH---"
Suddenly, Cyrus enters the courtroom, with an animated Mike, fully healthy, wearing Kitchen Moss on his head. Cyrus explains his long game has been using Moss to infiltrate Port Charles. Moss, as part of an alien species, is ready to invoke a vegetable uprising, where Cyrus takes over the world. Cyrus commands Moss Mike to kill Sonny. Sonny weeps and pleads Mike not to do it. Suddenly, we see Jason whip out his gun (in a courthouse, mind you) and aim.
Cut to black. Sound of gunshot. Caption: "To Be Continued".