As of Servoy 5.2, the database bundled in the Servoy installer is PostgreSQL. Servoy 5.2 ships with PostgreSQL 8.4.
Ability to forms in windows. Windows differ from dialogs in the way that each windows shows up on the system bar, can be minimized to the system bar and windows can move behind eachother.
Even more robust authentication for clients.
For more detail, see New in this release.