Cleanup what's new

docs/source/whatsnew/pr/update-completion-api.rst

@@ -1,9 +1,26
 The completer Completion API has seen an overhaul. The old
 ``Completer.complete()`` API is waiting deprecation and will soon be replaced
-by the ``Completer.completions()`` one. While the ``Completer.complete()`` API
-was assuming completions would all replace the same range of text in the
-completed buffer, ``Completer.completions()`` does not. To smooth the transition
-we provide two utility methods ``regulrize...`` and ``stufff`` which can
-partially adapt between the old and new API. The new API is marked as
-"unstable" and can only be use explicitly when called from within a decorator
-we provide.
+by ``Completer.completions()``.
+
+This new API is capable of pulling completions from :any:`jedi`, thus allowing
+type inference on non-executed code. If :any:`jedi` is installed completion
+like the following are now becoming possible without code evaluation:
+
+   >>> data = ['Number of users', 123_456]
+   ... data[0].<tab>
+
+IPython is now capable of inferring that `data[0]` is a string, and will
+suggest completions like `.capitalize`. The completion power of IPython will
+increase with new Jedi releases, and a number of bugs and more completions are
+already available on development version of :any:`jedi` if you are curious.
+
+User of the prompt_toolkit interface should also see the type of the item they
+are selecting (method, attribute, module, keyword ...).
+
+The use of Jedi also full fill a number of request and fix a number of bugs
+like case insensitive completion, completion after division operator: See
+:ghpull:`ipython/ipython#10182`.
+
+Extra patches and updates will be needed to the :any:`ipykernel` package for
+this feature to be available for this to be available to other clients like
+Notebook, Lab, Nteract, Hydrogen...