http://games.kikizo.com/news/200508/141_p1.asp
See link for full info.
Well, hopefully this turns out to be true, I still have my doubts, as with any Shenmue news.
To sum up the article - the rest of the Shenmue saga (chapters 7-16) is apparantely "theoretically complete and waiting to be ported to Xbox 360, PS3 or Revolution" depending on who Sega can strike a deal with for the whole series. According to Adam Doree of Kikizo, AM2 have been working on this since the last game and Yu Suzuki has had no involvement since he left AM2 but the story should remain intact because it was all written prior to his departure.
I'm still in too much of a shock to have taken in the news properly but hopefully this means at least another Shenmue game will be released.