/usr/portage/sys-apps/mlocate/files/updatedb.conf has a 2 issues : devtmps instead of devtmpfs and devpts is listed twice
I suggest a revbump straight to stable for this one. I doubt anything can break by fixing this.
+*mlocate-0.26-r1 (05 May 2014) + + 05 May 2014; Lars Wendler <polynomial-c@gentoo.org> -mlocate-0.26.ebuild, + +mlocate-0.26-r1.ebuild, files/updatedb.conf: + Fixed some filesystem entries in updatedb.conf file. Thanks to Toralf + Förster who reported this in bug #509084. Committed straight to stable. +