The full announcement says Omari Hardwick, Sam Richardson, and Kacey Rohl will be repping S31.
The Academy portion just lists Alex Kurtzman and Noga Landau for now. I think a surprise guest isn't out of the question, but it's probably best to keep expectations low.
I'd actually love to see even some photos of the giant set they're reportedly building...
And this is the issue that I have with the outcome of the story. After all they did to "restore the timeline," we still have a past in which Gwyn shouldn't exist, because her father never goes back in time to enslave Tars Lamora and become the Diviner.
While I'm sure there's a way to logic it away, it seems to undercut the entire season, and what they were trying to accomplish.