I also use this chance to make some changes to the SlackBuilds to match next Slackware release, which is to make the default ARCH for x86 is i586 although it will still build normally for i486.
That said, master branch is now diverging from 14.1-mate-1.10 branch which will exclusively track and build packages for stable releases (14.1) only. Master branch is now following development version of MATE, thus there's a chance for new deps in the future. For those who are building from source and living in stable releases, please make sure to checkout 14.1-mate-1.10 branch.
MATE's ROADMAP is also updated with the new goal. Hopefully all of them can be implemented in this cycle.