In addition to MySQL, the phpMyAdmin demo server now provides also MariaDB. It is based on OurDelta packages.
So you can now choose either MariaDB or MySQL on login screen and play with either of database engines.
As can be already visible from our SourceForge.net devel page or from repository listing, there are already some Git repositories for phpMyAdmin. They are not yet being used for development, they are there just for developers to get used to new workflow. The only exception are scripts and localized_docs repositories, which were made master as of today and will not receive updates from SVN anymore.
Anyway the repository should have same content as SVN (as of yesterday) so if you find any problems with that please let me know so that I can fix migration magic.