It's RC, but as there is probably a bit of changes needed to ebuild, it might be better to prepare for the upcoming stable 1.3 Reproducible: Always
I have an ebuild ready in my personal overlay (poly-c). I already asked for testers in the forums (https://forums.gentoo.org/viewtopic-t-1036478.html) and if there's no negative feedback in the next couple of days I want to add that ebuild to portage.
commit 1fb08fe2ed703c87172c9ead38f96d8f8ede6e12 Author: Lars Wendler <polynomial-c@gentoo.org> Date: Wed Jan 13 18:20:32 2016 media-sound/clementine: Bump to version 1.3_rc1 (bug #571462). Package-Manager: portage-2.2.26 Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>