Shenmue III will not be at E3 at all according to the latest dev update.
Sony have announced that they are showing their E3 conference at 85 cinemas across America/Canada & latin america
Tickets are free & you can get them from playstation.com tomorrow
http://gematsu.com/2017/05/playstation-e3-experience-2017-announced
Sony Interactive Entertainment America has announced plans for its PlayStation E3 movie theater experience this year. On June 12, over 85 theaters across the United States, Canada, and Latin America will broadcast Sony’s E3 2017 press conference.
Attendees will take home an exclusive poster and #76 from the PlayStation Collectable Card series.
Tickets will be available free of charge at PlayStation.com starting May 30 at 10:00 a.m. PT while supplies last on a first-come, first-served basis. Sony notes that you should arrive early if you get a ticket, as receiving a ticket does not guarantee you a seat. You must be 17 years of age or older to attend.