Here's more things Tui said at the Tucson Library Event!
Book 16's protagonist will not be Bumblebee or Swordtail, but she wants to write about them again at some point.
Tui can't say what continent Arc 4 will take place in, but it's a place we haven't seen yet.
Tui can't say much about what's going on with the TV series but hopes there'll be some real news on it within the next 6 months.
Tui says she can't make promises about Darkstalker returning, but she says the series isn't done with Peacemaker and he'll have dreams that confuse him and his friends.
Tui has implied Kinkajou could get her own book in the future, as when she thought about it she wondered how else she could save the world.
Tui says we won't get a villian POV ever, as she doesn't want kids idolizing them and acting like them. But she's interested in writing a POV for a character that's complicated but not a full villian.