While it’s great that we got a confirmation that Yo-Kai Watch 4 is coming, Level-5 didn’t say any info on the release date or even a release window.
In the event, a Japanese trailer with English trailer was shown. We’ll have to wait until Level-5 releases this trailer online.
According to Level-5, Yo-Kai Watch 4 has content that requires the player ot have watched specific non-localized Yo-Kai Watch films to fully understand the game. While Level-5 cannot confirm it will localize these movies, it has expressed the desire to release it at some point.
Yo-Kai Watch 4: We’re Looking Up at the Same Sky first launched for Switch in Japan on June 20. We’ll have to wait for Level-5 or Nintendo, if they publish it, for a much definite release date.