I recall reading someplace (not sure if it was Patron or Twitter) but Interea is only supposed to have 10 chapters and we already got the third one. So later this year perhaps, but we likely will not have to wait for next year. Interea is important because is setting the background for a number of things in the Khemia story and so should reduce the number of flashbacks/rehash of things that would otherwise slow the Khemia story down.