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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. But as 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, and same goes for all extensions and solutions made for eZ Publish 4.x.
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