It's official now: Yii is on GitHub! We also switched to use GitHub issue tracker. Existing issues have already been imported into it.
Many users have requested for this, and we think it's a wise move to put Yii on GitHub to encourage more people to participate in developing Yii.
SVN users, do not worry. We will still keep our SVN repository. A synchronization between our git repository and svn repository will be done nightly.
Please let us know if you encounter any issues. Thank you for your support!