For samples, documentation, and usage information, please see https://ehcache.org.
We released the Milestone 5 on February 20th, 2016. This milestone is feature complete for Ehcache 3 and marks the start of release candidates production where the focus will be on performance and documentation.
The release notes contain the links to the documentation to help you get started
We are now working on producing release candidates. Expect mostly performance and documentation improvements in addition to the usual bug fixes.
See the milestones on GitHub for more details on the current status.