equery list --missing-binpkgs '*' produces a help message instead of the requested listing. The actual name of the long option is --binpkgs-missing.
Fixed in http://git.overlays.gentoo.org/gitweb/?p=proj/gentoolkit.git;a=commit;h=2dbf7cdbf216f257b564c3a9d1c00ca1981e6617
Already released in gentoolkit-0.3.0.5