Start writing up 5.0 changes.

docs/source/whatsnew/version5.rst

@@ -0,0 +1,43 b''
+============
+ 5.x Series
+============
+
+IPython 5.0
+===========
+
+Released June, 2016
+
+IPython 5.0 now uses `promt-toolkit` for the command line interface, thus
+allowing real multi-line editing and syntactic coloration as you type. 
+
+
+When using IPython as a subprocess, like for emacs inferior-shell, IPython can
+be started with --simple-prompt flag, which will bypass the prompt_toolkit
+input layer. In this mode completion, prompt color and many other features are
+disabled.
+
+Backwards incompatible changes
+------------------------------
+
+
+The `install_ext magic` function which was deprecated since 4.0 have now been deleted. 
+You can still distribute and install extension as packages on PyPI.
+
+Update IPython event triggering to ensure callback registration and
+unregistration only affects the set of callbacks the *next* time that event is
+triggered. See :ghissue:`9447` and :ghpull:`9453`.
+
+This is a change to the existing semantics, wherein one callback registering a
+second callback when triggered for an event would previously be invoked for
+that same event.
+
+Integration with pydb has been removed since pydb development has been stopped
+since 2012, and pydb is not installable from PyPI
+
+IPython 5.0 now uses prompt_toolkit, so any setting that affects ``readline`` will
+have no effect, and has likely been replaced by a configuration option on
+IPython itself.
+
+the `PromptManager` class have been removed, and the prompt machinery simplified. 
+See `TerminalINteractiveShell.prompts` configurable for how to setup your prompts. 
+

docs/source/whatsnew/development.rst

@@ -11,13 +11,10 b' This document describes in-flight development work.'
     `docs/source/whatsnew/pr` folder
 
 
-
-
 .. DO NOT EDIT THIS LINE BEFORE RELEASE. FEATURE INSERTION POINT.
 
 
 Backwards incompatible changes
 ------------------------------
 
-
 .. DO NOT EDIT THIS LINE BEFORE RELEASE. INCOMPAT INSERTION POINT.