Hi John,
The Release and Support Lifecycle page that Stuart pointed you to is the best place to get GA and End of Support information.
The way V18.0 is being implemented is in Agile increments. V18.0 base or INC00 was released Aug 28, 2015. There will a number of Incremental enhancement releases which contain new features and functionality that can be downloaded and implemented.
For example INC01 contains the Approver Disqualification option which enhances the audit integrity of Packages by preventing Package approvers from approving their own work.
If you want to have this new feature, you would install V18.0 and download the APARs that make up INC01.
The easiest way I have found to locate the new features is to go to the Maintenance Grid on CA Support Online -
CA Endevor Software Change Manager Maintenance Grid - CA Technologies
and click on the New Features link in the PTFs Available column
The development team is working on the new features and functionality that will be included with INC02. When that is ready, it will be made available to everyone via downloaded Solutions. Each of the increments build on the previous increments so if you want the functionality introduced in INC02, you will have to have both INC01 and INC02 installed.
Does that help explain how V18 is working with the incremental releases?
June