PHP 7.0.0 Alpha has been released, it is said that in July 9th will be released PHP7 Beta 1. Php7 has been greatly improved in performance, and if Phalcon supports php7, it will get better performance. Do not know when to be able to support ?
Phalcon for PHP7 is in plans from quite a while, but it involves a lot of changes in the zephir part. Anyway, even if PHP7 will be released this year, I wouldn't go in production with it until next year; this way the community will have time to test it, report bugs and get fixed.
https://github.com/phalcon/zephir/issues/756