As is mentioned by Matthew Weier O'Phinney (and expanded on by Robert Basic) beginning immediately, the Zend Framework 2 project will no longer require developers to sign a CLA before submitting their code.
In #zf2 news, effective immediately, we no longer require a CLA for #zf2 contributions. Let the pull requests flow!
Robert gives a bit more detail in his post, pointing out the official git repo, the issues list, section on the wiki and the mailing list/IRC meetings. There's also a blog to follow to get the latest updates for the project.