There's 1-ish spot open for discussion, I think? When it becomes a more pressing concern, as in the number of predators to be added is running out, I'll probably hold a vote on it in the Discord server. The one potentially up for replacement is Crocodile (feral). I've had some suggest a Fairy Queen, but I will keep wolf girl in mind for this potential vote if it goes that route.
The number of predators getting added is set, so I'd need to be convinced to replace a current one planned to get a different one in. Can see the road map for this game on the Discord server.