It seems that Cedric has been playing again Shenmue 3 and he is impressed with the fighs in the game.
He couln't do anything except praise Yu for his magic.

He knows how to tease us!
I can't wait them to confirm they are taking Shenmue 3 to gamescom and show game play at last!

https://twitter.com/CedricBiscay/status/1017316225133600768

About the release date I think it's not very likely that they announce it soon, having in mind they have just delayed the game to next year. In my opinion it's more logical they announce it after september or near the end of this year. I hope it's the first quarter of 2019.

About the demo, I would like to have as soon as they can launch it but maybe in september or december as a "gift" it seems more likely.