"The current stable release is 0.5.3, “Photon”, released on August 28th, 2013."
0.5.4 is out. It is only to remove the src_prepare section and bump the ebuild.
0.6.0 uses lcms2
This version has already been committed by dilfridge. However, he failed to commit the updated patch, so currently we have no working ebuild.
+ 10 Jan 2015; Michał Górny <mgorny@gentoo.org> + -files/entangle-0.5.0+libgphoto2-2.5.0.patch, entangle-0.6.0.ebuild: + Remove unnecessary patch. Fix the ebuild not to use non-existing patches. Add + missing [introspection] deps. Now it even builds. The patch was no longer necessary since upstream integrated the fix.