My pet theory is that they will introduce the Maker as a very powerful spirit. Something that can make the opponents of the Chantry say "See? He's not a god!" while the advocates go "what are you babbling about? He's still the creator of Thedas!"
Isn't that basically what the Maker is described to be anyways?
The Chantry claims that the Maker made the Spirits to be just like him in every way, failing only to give them creativity like his own.
So, if we believe that account, the Maker sounds like he was simply the first Spirit from which all others originate, and differred from them primarily in terms of power and creativity. In this case, I imagine him to be something like "The Spirit of Creativity", as creativity is supposed to be the primary thing he cares about.
It's probably why he doesn't like to show his face all too often, and why he wouldn't mind dropping Darkspawn onto everyone. Necessity is the mother of invention after all. Making life on Thedas hard for everyone just encourages them to find creative solutions for survival. He wants people to use their imaginations and be original, not just come to him for answers about everything.
The more the Maker shows himself, the more people would expect him to show himself and the more they would expect him to solve their problems for them, and so they wouldn't bother coming up with their own solutions. They would just end up singing the same boring songs about how great he was, until he got bored and went away to make something better like he did with the Spirits.