As most people know, Wugfresh is working on version 2.06 of NRT. Until that's released, he has published temporary instructions for rooting Marshmallow here https://plus.google.com/u/0/113329792100896065459/posts/93WR63UHuEp
NRT just added 6.0.1 support
Shouldn't we all wait until we actually get an Invite before contributing to this thread? Nobody has an invite yet, so reporting that you don't have one doesn't really add any information. When they start arriving, then it'll be interesting to see...
This is the problem we all face when we depend on a program developed by one guy. If that guy loses interest in keeping his program up-to-date, we're screwed.
That's what worries me about lots of other stuff I depend on such as Tasker and Auto...
Version 2.0.7 is available