At this time there hasn't been any discussion about changing Magic in MegaPack.
One reason is there's debate on what are "improvements".
The ZetaPack version we sometimes play is version A1. I haven't asked titi to put it in the mod center yet because there are some things I noticed need changing. But we still play it sometimes and it can be downloaded from Jammy's google drive at
https://drive.google.com/open?id=1sK71diIdIaViSr8yPBUKnM_A8_IkxwqAI've set up repos for future changes, one of them is at
https://github.com/zetaglest/zetapack-testing so if you have any ideas for changes, feel free to use the GitHub issue tracker.
Docs aren't all in place yet. That repo uses 2 submodules. To pull and update them:
git submodule update --recursive --remote
while in the zetapack-testing repo directory.
If you're not a git person, I'll post updates when there's a release.
The reason submodules are used is to hopefully make testing and integrating changes from other factions easier in the future.