there is a newer version (2017) of texlive available at https://www.tug.org/texlive/acquire-netinstall.html
there is app-text/texlive-2017 in the tree already. see: https://packages.gentoo.org/packages/app-text/texlive
Oops, sorry :-( Could we possibly stabilize that?
in general we can stabilize texlive-2017, but it will take some time. https://bugs.gentoo.org/646638
Thanks! :-)