In The Cave, we saw Mr. Crow give Dale Vandermeer a golden cube, which, from what we've seen, is connected to the future and the full Elixir. I guess the stuff made by James in Roots and by Mr. Crow in The Cave was a partial extract, not as potent as the full thing (which explains why James died but didn't become a Corrupted Soul, and why the Dog stayed a dog and just became immortal).
Anyway, something is definitely happening to Dale. From what I've seen, I think that maybe he's ascending to a higher existence. In Theatre, Mr. Owl said in that game that his mind is reaching a higher state of consciousness. Also, the sixth play is associated with the god realm, which is referred to by this picture. If you look closely at the right side of this picture, you'll see a really faint reflection of Dale.
Whatever the tenth Cube Escape is about, I have a feeling that it's going to be to the entire series so far what the stage "Roots" (1935) was to Rusty Lake: Roots. What do you think?