I´ve read somewhere, that Dante and some others are working on a Zutara-ending...Does anyone know, if it´s true and when it should be done?

It doesn't really matter since it would non-canon

Not sure if your still 阅读 this. But from what I've heard there are currently 2 projects. One with animation,voice 表演 and more: this one has currently been abandoned. I'm not sure. - Zutara finale project?

Then there is a 秒 one that is a simple comic. Its been on hold due to the artists being busy.- The 火, 消防 fly lantern?

Just 搜索 up Zutara project on google,it'll lead 你 to the info that 你 need :)

Also, 你 should watch this: link

Hope this was helpful :)