User blog comment:ShipUltimateEnsign/Ultimate Goop, Ultimate Rath, and other Ultimate Forms/@comment-4684185-20120304231316/@comment-5672192-20120304232051

He's not saying that they will appear. He's saying that they exist. I'm not sure which creator/writer confirmed it (think it was Dwayne), but they said that every alien that exists in the Ultimatrix as of when Albedo had the Ultimatrix has an Ultimate form.