Here are migrations that are in progress that are awaiting a case study:
- Wikipedia is moving from MySQL to MariaDB (December 2012). See also Wikimedia engineering report, December 2012 (under Technical Operations, Site infrastructure, 2nd paragraph)
- Fedora is considering replacing MySQL with MariaDB. Discussion is also on Slashdot: Fedora 19 Nixing MySQL in Favor of MariaDB (22 January 2013).
- MySQL, MariaDB & openSUSE 12.3. This is great news, openSUSE is moving to MariaDB as a default.