>>357326610%, Nintendo doesn't do big reveals in E3 anymore, they prefer their own press releases/events these days.
Also it would be stupid as fuck for them to start talking about their 2019 product while they're still going to have to sell the 2018 product. They're aimed at different demographics but there is significant overlap and a lot of the hardcore fans will buy the 2018 game anyways unless Nintendo manages to convince them to wait for 2019.