This thread proposes a release process for Juju:

https://lists.ubuntu.com/archives/juju/2012-April/001431.html

The basics:

• Keep it simple
• 6 weeks of open trunk
• 1 week of stabilization
• 1 week of testing/critical fixing reserved
• Aim to drop releases before FeatureFreeze in Ubuntu
• Release series minor version bumped if backward incompatible changes are made
• Semantic versions adopted (starting at 0.5.0 which is the version of juju in lp:juju when release process starts)