The main gentoo tree will be moving to the md5-cache metadata on August 1st. At that point, euse will break since it does not understand the new format. See:http://archives.gentoo.org/gentoo-dev-announce/msg_617a4fc196c18c62c79d584f07c36c69.xml
Support for md5-cache has been added with the following commit: http://git.overlays.gentoo.org/gitweb/?p=proj/gentoolkit.git;a=commit;h=6b94fbd3b74471cf9740a35d669963e0b6c84eac
Released in gentoolkit-0.3.0.6-r3