Extends PHP to a consistent, fully object-oriented coding standard with Unicode support for OOP strings, components for i18n/L10n, and with other essential features for creating modern web applications
Why is the PHP 7 section in past-tense when it hasn't been released (or even had an alpha release) yet? A lot of the information in this section is basically incorrect or at a way-too-early stage to determine.
Saying that PHP7 will only include the performance improvements (of phpng) is massively incorrect. Development on PHP7 has only just started and it's already going to include Uniform Variable Syntax, 64-bit improvements, Catachable "call to a member function", almost certainly Abstract Syntax Tree and possibly (in some form) Joe Watkin's unicode strings. And that's just for starters - there's a long way to go before PHP7 gets released (enough that a number of developers want a PHP 5.7 release).
There's also a number of RFCs that have previously been under discussion that will almost certainly be brought up for inclusion in PHP 7.
The project Readme.md refers to the php.net PHP implementation as being called Zend Engine. This is incorrect. php.net PHP is built using Zend Engine - they are not the same thing. Calling the php.net PHP implementation "Zend PHP" or "Zend Engine" is incorrect.