From 8.0.0 release and beyond, release notes are published on docs.openstack.org.
##2015-11-25 - 7.0.0 ###Summary
This is a backwards-incompatible major release for OpenStack Liberty.
####Backwards-incompatible changes
####Features
####Bugfixes
####Maintenance
##2015-10-10 - 6.1.0 ###Summary
This is a feature and maintenance release in the Kilo series.
####Features
####Maintenance
##2015-07-08 - 6.0.0 ###Summary
This is a backwards-incompatible major release for OpenStack Kilo.
####Backwards-incompatible changes
####Features
####Bugfixes
####Maintenance
##2015-06-17 - 5.1.0 ###Summary
This is a feature and bugfix release in the Juno series.
####Features
####Bugfixes
####Maintenance
##2014-11-24 - 5.0.0 ###Summary
This is a backwards-incompatible major release for OpenStack Juno.
####Backwards-incompatible changes
####Features
####Bugfixes
####Maintenance
##2014-11-17 - 4.2.0 ###Summary
This is a feature and bugfix release in the Icehouse series.
####Features
####Bugfixes
##2014-06-20 - 4.1.0 ###Summary
This is a feature and bugfix release in the Icehouse series.
####Features
####Bugfixes
####Maintenance
##2014-05-01 - 4.0.0 ###Summary
This is a major release for OpenStack Icehouse but contains no API-breaking changes.
####Features
####Bugfixes
##2014-04-15 - 3.2.1 ###Summary
This is a bugfix release in the Havana series.
####Bugfixes
##2014-03-26 - 3.2.0 ###Summary
This is a feature and bugfix release in the Havana series.
####Features
####Bugfixes
##2014-02-14 - 3.1.0 ###Summary
This is a bugfix release in the Havana series.
####Bugfixes
##2014-01-13 - 3.0.0 ###Summary
This is a backwards-incompatible major release for OpenStack Havana.
####Backwards-incompatible changes
####Features
####Bugfixes
##2013-10-07 - 2.2.0 ###Summary
This is a feature and bugfix release in the Grizzly series.
####Features
####Bugfixes
##2013-08-07 - 2.1.0 ###Summary
This is a feature and bugfix release in the Grizzly series.
####Features
####Bugfixes
####Maintenance
##2013-06-24 - 2.0.0 ###Summary
Initial release on StackForge.
####Features