I think Yu Suzuki showed too much work in progress material in the latest teaser.
The teaser was ok for the fans, but if YS Net want to sell the game to the new audience then they need to work hard on the new trailer started from NOW.
Explain why this sequel is important, what makes this series so special, show good facial expressions, amazing kung-fu moves, tell a good story.
Tell the audience that this is an indie game. Shoot the video about the dev team. Right now people are comparing this game with Uncharted 4, because it's exclusive to PS4 and was showed on their conference.
The majority of people on this forum is already bought the game and if we want to see Shenmue 4, which I believe visually will be a lot better than 3, than we need to deliver Yu Suzuki this message.
If we want this game to sell more than 100k copies, then start to generate ideas, what to show in the next trailer to interest a new audience. I believe that somebody from the YS Net are reading this forum now.