No, this has been available for YEARS on Mac/Win, so it's not a preview of anything. Self hosted vaults haven't been in the new apps for years either, although the last version to support local vaults is still available.

The latest versions of 1Password still support locally stored vaults. They only sell the cloud service subscription these days, but you can still use local/Dropbox vaults on every platform. (except for Linux it seems)