Yes you are confused. The 0MQ[0] have never been superceded by nanomsg. The deal as you are pointing out very clearly is that the two projects are alive and well.

On a related note, using jupyter[1], salt[2], circus[3] and building fruits have been a real pleasure too.

And lastly, a bit of info on how 0MQ and nanomsg differ[4].

[0]http://zeromq.org/ [1]http://jupyter.org/ [2]https://saltstack.com/ [3]https://github.com/circus-tent [4]http://hintjens.com/blog:112