I'm really loving the new upcoming Julie novel. Can't wait! The other two sound like Felicity might be returning in 2017. Teacakes could also be Samantha too.
Gunpowder and teacakes would definitely also be Felicity's. Such as the journey book.
Kathleen Ernst said she was writing another AG book but couldn't say who it was for. If it was for Caroline, she probably would have said so, because that's her character and Caroline is not a new doll or returning doll that she would not be allowed to give details of.