I dont think that shenmue 3 can be possible release on the wii u because is a console that right now isnt selling at all, comparing with ps4. See this video and you will know why Shenmue 3 or a Shenmue Hd remaster make sense on ps4: https://www.youtube.com/watch?v=rmu-l51VYTQ
However, for the same reason that Nintendo isnt selling consoles (wii u) makes the possibility that they are finding exclusive games for their console. So maybe that can be happening to attract shenmue fans to buy a new wii to get shenmue.
I give you this in argument:
Sega doesn't care. They seem to want to make Nintendo they're BFF, lately.
As much as it makes me sad to say. Sega is BFFs with the PC. Nintendo is essentially Sonic. And let's face it, Sonic on Nintendo makes sense.
But the PC side has most of their big franchises; Total War, Company of Heroes, and Football Manager. These are their bigger money makers.
There was a statistic not long ago that Sonic Colors (Wii Exclusive) sold as many copies as Sonic Generations (Cross Platform). This may have changed over time. But it doesn't make a whole lot of sense to spend money on the Cross Platform side, when most Sonic fans have a Nintendo system.
I agree that Shenmue makes the most sense on PS4. If nothing else, this is where Yakuza is exclusive. Even still with Sega's release of Yakuza Ishiin.