No, not a wiki product by the phpBB Group.
I am pleased to announce the addition of a wiki for syndicating code documentation and content at http://wiki.phpbb.com/
This wiki is a place where you can share your experience with the codebase of phpBB3. Anything related to code documentation, modding/styling tutorials can be added there. Please note that we currently only allow registered users to edit/add pages.
What it is not
The wiki is not meant to be a general documentation of how to use phpBB3. It doesn't describe how to register, post new topics, etc. - this can still be found within our user documentation.
The MOD Documentation available at phpbb.com will be slowly moved to the wiki over the next weeks.
The phpBB Teams.