Yakuza 4 should secretly be the real Shenmue 3. Lan Di was really a captain of a Chinese division of the Tojo Clan!
Anyway, can't really say if I think this is real or not. Dreamcast and other old Sega games seem to be making a revival these days (
and not just on the Wii), so I can't rule it out entirely. Though if it is true, it could potentially be a litmus test for Shenmue 3.
I won't really be putting too much thought into this anyway.