The Liquibase hibernate extension has been updated for both hibernate 3 and hibernate 4.
This release adds support for catching changes to sequences and unique constraints as well as a few bugs around data type handling.
See https://github.com/liquibase/liquibase-hibernate for more information and to download the 3.1 release.
UPDATE: A null pointer issue was found in the 3.1 release and fixed in a now available 3.2 release.