Changelog says new networkmanager works with dhcpcd-6 but dhcpcd? ( >=net-misc/dhcpcd-4.0.0_rc3 <net-misc/dhcpcd-6 ) in ebuild depends does not allow it.
Because of https://bugzilla.gnome.org/show_bug.cgi?id=704281 *** This bug has been marked as a duplicate of bug 476170 ***
I apologize, I didn't notice that 0.9.8.2-r3 was added. The dependency typo was fixed in CVS two hours ago: http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/net-misc/networkmanager/networkmanager-0.9.8.2-r3.ebuild?r1=1.1&r2=1.2