GNOME 3.26 was released in Sep 13, and in Sep 14 is on Arch!
you realize this is a community repo, but it works great! if you run Antergos you can add it too!
you should add it on the top of your repos on
/etc/pacman.conf
[gnome-devel]
Server = http://softwareperonista.com.ar/repo/archlinux/gnome-devel/x86_64
SigLevel = Never
in case of issues, remove it and downgrade!
SONG
SRVVRS - Ruins