The ModeShape open source project uses its JIRA instance to track issues for tasks, requirements, bugs, and other activities. The roadmap report shows how each of these issues are targeted to the upcoming releases, while the change log report shows all of the issues that were fixed in each of the past releases.
By convention, the ModeShape project team periodically review JIRA issues that aren't targeted to a release, and then schedule them based upon current workload, severity, and the roadmap. And if we review an issue and don't know how to target it, we target it to the Future Releases bucket.
At the start of a release, the project team reviews the roadmap, identifies the goals for the release, and targets (or retargets) the issues appropriately.