Uh...why would E3 2019 be too late for a late 2019 release? Besides, I've heard that the Splatoon team is made up of the core Animal Crossing team, so that is definitely something to consider, especially since they are releasing all kinds of updates and DLC for Splatoon 2. This is possibly putting AC to the side. That's just what I've heard, and googling it just gives me varying answers as to how many of the team-members could possibly be overlaping.