Collation of all columns with a type VARCHAR are changed to Latin1_General_CS_AS. The default collation associated to the database won't be used anymore as the collation of VARCHAR columns is now forced each time such column is added.
Cross-project duplication was missing in SonarQube 5.2, it's now back in SonarQube 5.3.
However, please note that it slightly differs from how it was working before:
The Developer Cockpit and Report Plugin are compatible with SonarQube 5.3.