2.5 years was far far too long between preview builds & based on some of the more constructive feedback received from that time & with the build finally having gotten to generally good state, a “beta” preview build is now available before a proper preview build is made available next month (October 2023) when the more formal release will occur.
This is because I know there’s going to be issues that haven’t been caught during beta testing so it’s being treated as a beta preview as that’s what people were wanting to get the closed betas before a new preview build so that’s what we’ve got.
The cumulative changelog for everything between 1.0.21.7236 & 1.9.19.16956 (though it’s not everything as that doesn’t account for inter-build issues) can be found here.