Unless the budget is 60+ million, (including marketing) it's definitely not a AAA game. The WItcher 3 cost ~ $12 Million USD for development and $80 Million for total (development + marketing), which for a AAA game is on the incredibly low-end where as a lot of AAA games cost hundreds of millions to produce. That's not to mention that CDProjektRed had around 220 in house employees working on the game with an additional 1,500 other employees (contractors, free-lance etc) so probably a much bigger team than YSNet + Lakshya Digital for Shenmue 3.
I think if people are expecting a game as big as the first 2 then you're going to be sorely disappointed. That's not to say that it's not going to be an amazing game with a lot of cool stuff but I highly doubt it'll be as dense as a traditionally funded game.
Anyway, just to be clear I do expect some secrets, and a bad ending. I don't expect we'll be finding new things in the game for 15 years later as we had with the originals though.