For samples, documentation, and usage information, please see http://ehcache.org.
We released 3.0.2 on June 6th 2016.
The release notes contain the links to the artifacts and the documentation to help you get started.
We are now working on the clustering tier of Ehcache 3 which will be included in the 3.1.0 release. You can also expect bug fix releases on the 3.0.x line.
See the milestones on GitHub for more details on the current status.