There's no official changelog, but there's a community-maintained one here (it's pinned in the Discord): https://docs.google.com/document/d/1j3eWRrvBhkN3y01ycox8xnAOxR9EZX0BLkGtaotvIhs/...
You can see the changes made in the 1/8 version. According to others, the latest update today (2/2) just corrects typos, fixes font issues, etc. - no real rules changes. This is the version being sent to the printers for those that backed the Kickstarter at the hard-copy level ($60 and above).