The long-term roadmap is managed with the label roadmap of Github issues: https://github.com/INRIA/spoon/issues?q=is%3Aopen+is%3Aissue+label%3Aroadmap
All feature requests have the label feature: https://github.com/INRIA/spoon/issues?q=is%3Aopen+is%3Aissue+label%3Afeature