Maybe its a design decision, but if I use %matplotlib ipympl in a notebook, there is no image of plots I've made is saved in the *.ipynb file as there was for nbagg. Thats a huge usability issue for me.

I think the cool thing about notebooks is being able to see the output of your work without having to re-run all the code, some of which may no longer work (data moved etc), so this is a pretty big reversion in functionality for me. It also kills the ability to quickly post onto GitHub or gist, and even save as html no longer has a plot. If this is to replace nbagg I hope the image saving gets added back in.

Of course, maybe I'm just doing something incorrectly. This was with master on matplotlib and master on ipympl. Jupyter-notebook = 5.0.0