Above mentioned kicad-4.0.1-r1 ebuild has not had issues for quite some time and no bugs were open against it. Please move to stable tree.
CCing arches is up to you as maintainer :) In general, simply assign the bug to the maintainers, set STABLEREQ in keywords and CC arches is the way to go Of course after checking you don't need to stabilize other dependencies, in that case you need to get the stabilized before or together to this one
Arches please stabilize this package, if there are no known issues on your side.
amd64 stable
x86 should jump to bug 600996