Tested with zodb-3.7.0 (for which ebuilds are coming), this simple version bump seems to work fine. Also, I removed the doc USE flag as the files that it is installing are already included in the default install.
Created attachment 130000 [details] zopeinterface-3.4.0.ebuild
http://pypi.python.org/pypi/zope.interface/ (which I believe should be set to HOMEPAGE, instead of the version specific page) says 3.4.1 was released in October.
This version is needed for Python2.6.
zopeinterface-3.4.1 is in CVS. Changed HOMEPAGE as well. Thanks for reporting :)