Which is... fascinating. Switching out upstreams is one thing, but they're switching kernels in the process!
EDIT: more comments from finishing reading:
Looks like they do broadly intend to work with the Void upstream, so I'm quite pleased (as a Void user) that there will hopefully be more people contributing, especially on the musl branch.
> We will not be creating a migration path from the FreeBSD-based Project Trident to the new Void-based version. Please be prepared to copy your user data (/home/*) to a temporary location like a removable drive before installing the new version and copying the data back.
That's quite unfortunate. In particular, if they do integrate ZFS into Void including boot environments, there shouldn't be any reason they can't do it in place; just install into new filesystems and mount the old `tank/usr/home` as though nothing had happened. Unfortunately you would still lose direct binary compatibility, since Linux doesn't have a FreeBSD personality to use, but I don't see why you should need a new pool or home.