this is generic message. the package is still using dead code which might get out of duty anytime soon.
please update from udisks:0 to udisks:2.
There is port to udisks2 available on github:
The ebuild for 2.0.0alpha1 has yet to be written.
2 years later, 3.2.0 is in portage with udisks:2 support :)