I think the decision on what the MKII should or should not be, was made months before we even knew about it. And I'm confident Elektron hasn't looked back since. They've been clear what the MKII is and also what it's not.
I would imagine the MKII is about done and finished. It goes through QA, and they can't do a Digitakt on this one and just ship it then fix it, cause the Octatrack's been out for years, they have most likely thousands of Octatrak MKI users that will upgrade, learm the new machine in an hour and then put it to work in studio and on stage.
You can't have the Digitakt scenario there, where it crashes and behaves and an update weeks later fixes about half of the first batch of issues. This is a pro piece of gear that's worked its way into workflows and performances all over the world. It has no grace period. It needs to be rock solid from launch, or Elektron's rep of shaky QA will take an even deeper hit.
Again, I'm guessing, but I think they're looking for all the unknown unknowns still, and only because the MKII can't be any less solid that the MKI. That's their one and only focus. As it should be.