Zend Framework 3 will be an evolution of ZF2, with a focus on three main points - simplicity, code reuse and performance.
Priority plans include:
highlighting the components of the framework into individual, versioned projects (hello, symfony!);
special emphasis will be placed on HTTP messages, which will be aligned with PSR-7 ;
The existing full stack MVC framework will be updated and will begin to depend on new independent components for reuse and simplification. ZF2 MVC projects can be transferred with minimal effort to the new version, for which they will prepare a guide on migration;
using the concept of middleware , familiar to many in Ruby / Python, as well as the Slim Framework and StackPHP PHP frameworks, as a lighter alternative to the enterprise stack of the MVC framework ( an example of what is at stake );
the ability to use Apigility as middleware;
optimization for PHP 7, while PHP will be supported starting from version 5.5;
And now the main surprise is that a serious part of cogitative labor and coding has been left behind, therefore ZF3 will be released in the third quarter of 2015. ')
The rest of the details - including specific timeline releases, the direction of development and justification of specific technological choices - will be published on the Zend blog as soon as possible.