A recent post on Moodle.org notes that the community’s use of Concurrent Versions System (CVS) as a code repository has fallen dramatically in the past few years with the introduction of the much more popular Git. Starting 1/1/2013 Git will be the sole code repository moving forward.
For the average user (managers, students and teachers) this has no effect (except maybe happier developers and administrators?). For any developers or administrators managing the code, upgrades or other aspects of your Moodle installation you can read more about the change and Git for Administrators here and be assured that there are great docs to help even novice administrators manage Git to their benefit.
According to the docs, this allows Moodle-using orgs to “maintain a copy of Moodle on your production server which can easily be upgraded using Git.” Sounds handy. There is a truck load more of information, tutorials and discussion threads at http://docs.moodle.org/23/en/Git_for_Administrators.
Why is the Git logo an octopus-kitty-human hybrid? No idea.