Update 1 is now out.
To answer your first question as I said in the announcement post at https://itch.io/blog/661872/update-1-is-out, I'll be providing a complete list of changes in a development blog post later. To answer your implied question, I've still not decided what to do with the crew replacement rules. They're relatively easy to add back in, should I decide to do so. I can easily give you a modified copy of This Space Intentionally if you want to try them out.
Ah, great to know; for some reason, the announcement post is not linked on the game page, so I was unaware of it.
I would love to get a modified copy to take a look at the replacement rules if you would be so kind. You once sent me the Third Wave expansion, so I think you should still have my email address. Please let me know if you don't.
It's actually easier for me to update the live release, as I found some terminology that hadn't been updated to the latest version while adding it back in. Crew Replacement rules are in the events section of the Missions chapter and described in the Politics chapter. You should be able to download the updated rules as of now. I've also done some minor formatting updates on the main rules which is why they've been updated.