I have just pushed changes live that give all islands access to our brand new "new-new" treaty system.
You can find
the details on the wiki.
Basically, this is much like the "new treaty system" that had been broken around for a long while, except the game mechanics. Treaties are just texts that you sign, with a bit of mechanics for the signing process behind it. Making them free-form gives you, well total freedom in making up any treaty you want.
Existing treaties have been kept, so you should definitely check your treaty status and update your signatures on them. Right now, there is no cleanup of treaties, but soon treaties where all partners have withdrawn will be deleted.
Many thanks to Tim for his efforts, even though a large amount of the game-mechanics code for the new treaty system has ultimately been thrown out, the core of the system, including most of the database structure, is very much his work.