...

Feature releases are planned for every 4 months, with a 2 month overlapping development window., as shown below:

TBW

Versioning Numbering

Starting with our 4.0.0-incubating release, Apache CloudStack makes use of Semantic Versioning for it's release numbering. One exception to this numbering scheme, is that the "-incubating" qualifier will be added to all release numbers until the project graduates from the Apache Incubator (this is specifically due to the rules stated in the Guide to Release Management During Incubation).

...

The community may decide to increment the major version number in situations where underlying implementation details require a operator to face significant challenges in upgrading from one version to the next.  These should be rare situations.

Release Branch Lifecycle Image Added

Support Lifetime

TBD

Other Resources

...