Even though based on the pre-release versions it looks like not much has changed in Mautic 3, the upgrade to the new version of the Symfony framework is important, because the previous version of Symfony will no longer receive security fixes. Mautic 3.0.0 upgrades the Symfony framework to version 3.4, which receives long term support through to November 2021.
Also Mautic 3 supports PHP 7.3 extending security support through to December 2021.
We tested the alpha version of Mautic 3 and are pleased to see that almost all of the existing features and integrations have been successfully ported over to the 3.x branch of Mautic. Yosu’s remarks about the uncertainty of Mautic 3 are based on the status of the project just after the Acquia acquisition of Mautic Inc. Now that Acquia’s engineering team has been lending support to Mautic to develop Mautic 3 for over 6 months, the project is in a much better shape.
Although users might understandably not want to update to the 3.0.0 release of Mautic, we would strongly suggest them to upgrade as soon as 3.0.1 or 3.0.2 are released. Here are our impressions about Mautic 3.