I've just posted the 3.1.6 on GitHub for those who want to jump onto the new version right away.
https://github.com/PortableApps/Toucan/releases/tag/3.1.6
There is a couple of bugfixes, 7-Zip version update and "Do Not Log Skipped Files" option for Sync (as requested on the forum earlier) in the box. I'll give it a week and change the status to "Release".
UPDATE 05-Jan-2019: There seems to be some regressinon in the Sync feature, I'm currently investigating, so this version is still in pre-release mode.