I play with some of its parts, currently investigating if it is a good idea to run Plan 9 as my backup server.
There was no Git client for Plan 9 before. Now there is one, and it perfectly fits Plan 9's general concept: Everything is a file system. Even more so than on Unix: Even sockets are a file system - in fact, you can even import a different Plan 9 computer's network stack right into your machine. Admittedly, most of it only makes sense if you have more than one Plan 9 computer.