Last I looked at their releases of code, they had branched from ZFS before it became OpenZFS, and had a lot of proprietary extensions beyond just the reshaping (from memory, they implemented encryption differently, as one example, and I think they had one or two checksums that I assume were because something they shipped had hardware support for it?) so I wouldn't hold out hope that their goal is to rebase on OpenZFS unless they announce something to that effect.
Nah, I doubt they're going to rebase to openzfs. There's too much divergence and I don't see them putting the time to write something that converts their zfs format to openzfs without an extremely good reason.-
