I feel it almost assuredly did, because the technology and assets were all ported over at that point, making a Wii U version very straightforward.
The main difference here is that they ported Yakuza 1 + 2 and not their technology stack for Yakuza 5 that's now heading next-gen afterwards.
And let me reiterate I don't think this is any better than a 50/50 proposition- I just think think it would be extremely odd to release this out of nowhere without some sort of planned follow up.