Out of fears that Oracle is making MySQL a more closed software project and not being happy with the overall direction of this widely-used database software, Fedora developers are looking at replacing MySQL with MariaDB in  Fedora 19.

via [Phoronix] Fedora Looks To Replace MySQL With MariaDB.

MySQL would still be available in the Fedora repository for at least one release as the more conservative users make the migration from MySQL to MariaDB.