The new app api keys are documented [here](http://docs.octoprint.org/en/devel/api/apps.html).

The format of the `_octoprint._tcp` service identifier can now be found on [the wiki page of the discovery plugin](https://github.com/foosel/OctoPrint/wiki/Plugin:-Discovery#zeroconf-service-_octoprint_tcp). 

Happy New Year :)