Check out the bottom of the most recent PHP Weekly Summary. The first I've heard of PHP 5!
"Right before we went to "press", a small discussion thread appeared on the list that was sparked by a message from Andi Gutmans. It seems Andi is contemplating putting an alpha version of PHP 5 on the actual php.net website. Doing this will allow the developers to test the new object model that had been created in the new zend engine, as well as get some feedback from users as to what else they feel may be missing. Look out for the release in the coming weeks."
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