We use GitHub’s milestones to releases’ planning and anyone is free to suggest an issue to a milestone, and discuss about any issue in the next tsuru release.
At globo.com, we have goals by quarter of a year (short term goals below), but it doesn’t mean that there’s only one release per quarter. We also have internal goals and our focus will be on these. But they are not immutable and we can change any goal at any time as community need. Our releases have one or more main issues and minor issues which can be minor bugfixes, ground work issue and other “not so important but needed” issues.
You can suggest any issue to any milestones at any time, and we’ll discuss it in the issue or in Gitter.