Recent versions of IPython add experimental support for adding type data to the list of completions. This is provided by thereply.metadata._jupyter_types_experimental field of the completer reply. Some of the main points of the PR:

• If the type data is provided by_jupyter_types_experimental render the types visually.
• Don't make any assumption about the values provided by the kernel. This is done to allow each kernel to provide their own unique type names.
• Visually encode the types using the category10 colormap of vega (https://github.com/vega/vega/wiki/Scales#scale-range-literals) and a lowercase first letter of the type name (sofunction becomesf).
• A bit of style cleanup of the completer.

This work uncovered some refactoring of the completer that we should probably do post-beta. I will open a separate PR describing that work.