Hi there.
The current plan is to bring all of my MV plugins over to MZ. The more advanced features of this one, namely the additive ingredients feature rely on independent items to function, though, so those features will not immediately be available until Yanfly's item core plugin is ported, or a suitable replacement is found.
Unfortunately, I don't have an advance copy of MZ, so I have no way to know how easy or hard porting this one will be until MZ is out and I've had a chance to poke at it a bit.
What I can say for sure is that the MZ version of this plugin will be separate from this version, with a discount if you've already purchased the MV version.