It looks like PHP is going to get another built in performance boost. The plan is to integrate and open source the Zend Optimizer+ component. The fastest Opcode cacher out there. Zend has provided the source. Which is already available on github. So we get the Opcode cacher to boost out applications even more. And the community can extend and built upon the available source code. Win! Win!
PHP 5+ has come a long way performance wise without the Optimizer component. But being able to apply opcode cache out of the box is a great addition. And so far the benchmarks look promising. The Optimizer+ component beats APC hands down in all performed tests.
Read more about Opcode caching and the integration process here.