Please note that SQL Workbench/J has no relation to the product MySQL Workbench which is maintained and owned by Oracle.
If you are looking for MySQL Workbench support please contact Oracle.
A development build is generated while testing and implementing new features for the next stable build.
Bugfixes will show up in these builds first.
Current dev-build: 121.5, 2017-01-14 (Change Log)