Changes that are planned for inclusion in a future version, but for which there are complications or blocking issues which preclude implementing the change in the timeframe of a known release, or which are open-ended projects (such as expanding documentation) that don't have a definite end-point.

If these changes are important to you, help with addressing them will get them into a release sooner - so don't hesitate to update the issue or - better yet - submit a pull request.