The trailer is called "The Hidden Art Returns" and starts with Ryo undergoing training with a grandmaster on a bamboo raft at the Niaowu port, who explains how kung fu has been passed down through the ages despite being banned at times. The second part of the trailer shows Ryo confronting thugs, chasing them through the streets and facing an ambush in a warehouse.
Here is a clip of Yu Suzuki introducing the trailer, captured from the Twitch stream. Acting as interpreter is Shenmue III executive producer Hideaki "Harry" Morishita.
A Japanese-voiced version of the trailer has also been made available:
There is a lot of interesting detail in the scenes, which we'll run through in a separate analysis post. Become a Patron!