What are we looking at in upgrading to 6.7?

Does this pretty much cover it?
Is there a ns changelog I’ve missed?

https://wiki.centos.org/Manuals/ReleaseNotes/CentOS6.7#head-10b67e87aced2dd75a4c584c7d996afa53136b31

See this topic: NethServer 6.7 roadmap

I just created a query to track the work: http://dev.nethserver.org/projects/nethserver/issues?query_id=63
Proposal deadline is set to 15 of September.

This is a rolling release so a lot of enhancements/fixes have already been released during the last months!