At the conference it was announced that phpBB was considering moving to a Symfony basis for their upcoming version 4. Since then, an RFC was posted and given the schedule for the Libertyvasion conference organized by phpBB, they're gearing up to dive deep into Symfony. This article reflects the thoughts I've offered at the Libertyvasion Conference on the combining of powers of phpBB and Symfony.
He talks some about each community, what they're all about and how this coming together might effect each side. He does list a some of the positive side effects of this collaboration - things like more skilled developers, providing a good solid use case for the framework and easier integration of the forum into a pre-existing site. He also includes a few ways for those interested to help out with the project.