"Cooperation" is a vague term. It can be as little as an arm's length administrative deal or as intensive as a full-blown R&D partnership. Since Harman's work for Fuji only requires the former, I'd consider this more likely. And that would be virtually meaningless for other film products made by Harman.
Consider that Harman has no technology that's of particular interest to Fuji, so some kind of R&D collaboration between them would be very biased towards the competence of Fuji. Logically it would only materialize if Harman put big $$$ at the table. Money they likely won't have in the light of the investments needed to keep existing infrastructure functional.
The whole idea of Harman having secretly figured out a fully fledged color film product in total secrecy over the past years sounds very frivolous to me. On the other hand, Harman engineering a new-ish B&W film based on their existing competencies seems quite likely. Hence my expectation that this is something like Harman Pan 1600 that's about to hit the shelves.
Would make good sense for the winter season, too, speaking of timing.