Yes, we're moving to github for GIT and pull requests, and will keep using Trac for all ticket management.
We hope that being on GitHub it will be easier for anybody to contribute to Piwik via pull requests, and we will be actively looking at all pull requests for consideration.
Thank you for reporting any suggestion or feedback regarding this.
(In ) Refs #3721 Removing test SVN keyword $Id$ test since GIT does not have this feature.
NOTE: we probably should run a script to remove that line $Id$ from all php / js files in piwik...
In aa7547ddf2fecb9b2edcf8ca93064d057d60f901: Adding .gitignore refs #3721
we haven't done the GIT mirror yet but it will happen later