The place to exchange information on the topic of eZ Publish 5, so we can push it ahead together.
This forum was formerly named "the new PHP API", which is now one of the elements of eZ Publish 5.
You may want to have a look at the initial announcement (note that there were several other posts on the topic since then):
An Explosive Cocktail: Symfony and eZ Publish 5 Joining Forces
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