All he wants, is Galifrey back in the heavens. That's all. No brilliant schemes, no conquer of earth. He wants Galifrey. He wants fields of deep red grass, silver leafed trees, burt orange skies and glittering pinpoints of blackness that dance in the sky. He wants to play with Theta, before it all happened, before Theta became the Doctor, before they raged a private war. He wants to shout at his father, the father he last saw impailed, sulk at his mother, who was destroyed as part of the last great purge. He wants to feel good again. He wants the drums to go.
Not that he'll tell anyone, of course