Yes, there are plans. There is currently a PDF version, floating somewhere in the Github repo. This version is out-of-date, and is only a draft. A more physical book may be coming mid-fall though.
I admire the approach and allowing anyone to contribute, but for me to delve into things, I personally prefer something I can take offline and browse and take some notes on...PDF really is the best bet and would be helpful for me in this case...