Twig 1.10.0 has just been released.
This new version adds several nice features.
Functional Test Framework
Twig has a test suite composed of unit and functional tests. For functional tests, we have nice abstraction that allow us to write tests very easily. As of 1.10.0, this abstraction has been extracted so that you can now benefit from it and write your own tests for your customized filters/tags/functions/tests.
Namespaced templates support
Twig now support namespaced templates. It help organize your template in a better way.
You can learn more about these new features in the documentation or directly from the diff: https://github.com/fabpot/Twig/compare/v1.9.2…v1.10.0