On the PRofessional PHP Blog today, there's a look today at some of the framework consolidation that's been going on - and how it might relate to Zend's offering.
Will there be a similar consolidation of PHP Frameworks? Or will Zend PHP Framework rule them all? eZ systems for one isn't conceding just yet and continues with their eZ publish Enterprise Components. I expect other to do the same. We shall see.
There is recent interest in consolidating Java frameworks with similar approaches. Java Web Alignment group brings together many big players in the Java framework space.
He also mentions WACT, his framework project, and reasons why he, personally, might not join forces with another framework just yet...