I am not sure if that is going to happen, at least not in 4.x. We do know that this patch will finish the Doma side of the story, so having Garlemald attack them again would feel a bit strange. Maybe Maxima will cover up the accidents around Doma because he is against Asahi and thus we are saved from any counter attack. This way we would also have a person that might help us if we ever get to Garlemald, so I would be fine with such a NPC. (As long as he does not betray us on the way)
About the content that will surprise people: There was a reddit post about recent interviews that hinted that maybe the new stuff will be with the beast tribe. But its not 100% confirmed.
