The real bug is in pyside (#744741) which does not publish egg-info. If/when pyside is fixed, this package will have to depend on the pyside package that provides the egg-info, which will probably be the current metapackage.
Alternatively, the easy_install generated script could be replaced with something that does not depend on pkg_resources. (e.g. a bash script that runs python2.7 -m pivman, as suggested by Alexandre Vaissière in 744741)
