On the PHP internals mailing list Zeev Suraski, a long time core contributor of PHP, started a discussion on what PHP 8 could look like.

As I mentioned a few days ago I intended to send it slightly later - but as Nikita brought up the topic of PHP 8, this is probably as good a time as any to start the discussion. Please note: The goal of this email isn't to discuss in detail each and every topic that's mentioned, but rather to establish whether we want to move to focus on PHP 8 as we go beyond PHP 7.3, based on some of the research projects and PoCs we've been working on.