Hi. Here you got the release note and all about the collaborative editing feature: Confluence 6.0 Release Notes | Confluence Data Center and Server 8.0 | Atlassian Documentation
I also recommend our microblog and blog, to always be on top of any Atlassian news:
https://microblog.seibert-media.com/
https://blog.seibert-media.com/
You can subscribe to our newsletter right there in the blog by just typing in your email.