The development of Zend Framework 2 precedes and many alterations should brace the dominant position of this framework. The team plans to release no less than every six weeks a new release. In this first beta release the biggest change is the new MVC layer which is completely reworked; built on top of HTTP, EventManager and Di.
Other refactored components are Sessions, Exceptions, EventManager-, Dependency-Injection and also the Zend-Cloud-Infrastructure.
If you want to know more about the new MVC of ZF2, there's already a Quick Start online.