gnome-base/gvfs need udisks 1.x via "+gdu" flag, even udisks 2.x merged.
1. dev-portage@ is bugzilla mail for sys-apps/portage, use the Gentoo Linux component when filing bug 2. this is a duplicate, and completely expected, udisks:0 and udisks:2 can live together *** This bug has been marked as a duplicate of bug 440866 ***