eZ Publish is an Enterprise Open-Source Content Management System/Framework (CMS/F) at its core. It provides a Content Repository, Content Management and Web Content Management ("WCMS") capabilities and is highly extendable. Its commercial Enterprise offering is named eZ Publish Platform, it comes with Support and Maintenance as well as a set of features and services offering an Enterprise-grade solution. It also offers the access to additional services provided through the Cloud covering the domain of Customer Experience Management (CXM).
Version 5 represents a big step forward for eZ Publish, as it introduces a whole new architecture and embraces the full Symfony2 stack and community around it. As is often the case with architecture, most of it is under the hood in current releases, and there is no new User Interfaces (UI) yet running on the new kernel; however with our "Dual-kernel" approach all existing UI's are still here running on legacy kernel.
From high level 5.x kernel is:
For more information on the status eZ Publish 5.x, known issues, change logs and architecture updates, see the latests release notes.