Gnome 46 is out ... what does this mean for Zorin?

I would say it's unlikely in the current release. A desktop environment it's quite the collection of software packages, and upgrade them all without breaking something else in the underlying system can be tricky.
Zorin OS in particular also relies on a number of Gnome extensions that tend to break between major versions of Gnome which makes things more difficult.

To get the latest possible packages available you can use what's known as a rolling-release distribution. Those are distributions that don't have the same version scheme like Ubuntu, Mint, Debian or Zorin OS, since they are constantly being updated.
If you are curious about this, I recommend trying Fedora* or OpenSUSE Tumbleweed

* Fedora is not technically a rolling release distribution but it uses a very fast release cycle as to stay very up to date.