Looks like the only code they've published is here: <a href="https://svn.apache.org/repos/asf/incubator/nifi/" rel="nofollow">https://svn.apache.org/repos/asf/incubator/nifi/</a><p>So it's only the site code for now. We'll have to wait, then. NiFi looks interesting...
Appears to be in Apache incubator: <a href="http://incubator.apache.org/projects/nifi.html" rel="nofollow">http://incubator.apache.org/projects/nifi.html</a> (svn has only the site as of now.)