The Plone Foundation announced today that Plone 4 has moved from Beta testing to Release Candidate status. If you have been waiting to migrate to the faster Plone, it is available.
Plone 4 not only has increased speed, it is more user friendly and features improved group management. Products like Lineage and PloneFormGen have been tested and are compatible. For a complete list product and their compatibility with Plone 4, see our Migration page.