Mate has released r1.16 of its desktop environment, see http://mate-desktop.org/blog/2016-09-21-mate-1-16-released/
I'm not really sure why we needed a bug for this right now... But for informational purposes, we aren't starting to do the bump for another week, at which time it will be in the project repo until such time as it is deemed ready to move to the main repo.
I've got a few hours to spare next week, anything I can do to help?
(In reply to Geert Braekmans from comment #2) > I've got a few hours to spare next week, anything I can do to help? Sure. If you come by #gentoo-mate on Freenode, you can join in when we start working on it.
Fixed a couple of months ago: https://github.com/gentoo/gentoo/compare/c2c56936126da0edeed173ad84465a788108935a...3cff597940afff7257a979126e7ab5623beb07c7