This plug-in installs correctly on WP 4.0, although the instructions aren't too clear : you have to install the auth_wpbb.php before to configure PHPBB3 options, and not the inverse.
Once everything is setup, it works correctly, but it doubled or even tripled the CPU usage of my site (which mostly comes from my PhpBB3 Forum usage), so I had to remove it.
Note: the extra plugin WPBB to publish posts from WP to PhpBB3 seems to be broken.
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