Note: there are more recent updates, see https://community.intersystems.com/post/updates-our-release-cadence
InterSystems is adopting a new approach to releasing InterSystems IRIS. This blog explains the new release model and what customers should expect to see. We laid this out at Global Summit at the end of the InterSystems IRIS roadmap session and have received a lot of positive feedback from customers.
With this new model we offer two release streams:
1) An annual traditional release that we call EM (for Extended Maintenance)
2) A quarterly release that is tagged CD (for Continuous Delivery) and will be available only in a container format.