Update next-release notes

docs/releases/next.rst

@@ -7,7 +7,13 @@ In progress
 Highlights
 ~~~~~~~~~~
 
-* The new async/await keywords in Python 3.5 are supported. TODO: say more.
+* The new async/await keywords in Python 3.5 are supported. In most cases,
+  ``async def`` can be used in place of the ``@gen.coroutine`` decorator.
+  Inside a function defined with ``async def``, use ``await`` instead of
+  ``yield`` to wait on an asynchronous operation. Coroutines defined with
+  async/await will be faster than those defined with ``@gen.coroutine`` and
+  ``yield``, but do not support some features including `.Callback`/`.Wait` or
+  the ability to yield a Twisted ``Deferred``.
 
 `tornado.auth`
 ~~~~~~~~~~~~~~
@@ -21,11 +27,24 @@ Highlights
 * Fixed an issue with the autoreload command-line wrapper in which
   imports would be incorrectly interpreted as relative.
 
+`tornado.gen`
+~~~~~~~~~~~~~
+
+* `.WaitIterator` now supports the ``async for`` statement on Python 3.5.
+
 `tornado.httputil`
 ~~~~~~~~~~~~~~~~~~
 
 * `.HTTPHeaders` can now be pickled and unpickled.
 
+`tornado.ioloop`
+~~~~~~~~~~~~~~~~
+
+* ``IOLoop(make_current=True)`` now works as intended instead
+  of raising an exception.
+* The Twisted and asyncio IOLoop implementations now clear
+  ``current()`` when they exit, like the standard IOLoops.
+
 `tornado.iostream`
 ~~~~~~~~~~~~~~~~~~
 
@@ -45,19 +64,46 @@ Highlights
   present; for other encodings `.load_translations` has an ``encoding``
   parameter.
 
+`tornado.locks`
+~~~~~~~~~~~~~~~
+
+* `.Lock` and `.Semaphore` now support the ``async with`` statement on
+  Python 3.5.
+
 `tornado.options`
 ~~~~~~~~~~~~~~~~~
 
 * Dashes and underscores are now fully interchangeable in option names.
 
+`tornado.queues`
+~~~~~~~~~~~~~~~~
+
+* `.Queue` now supports the ``async with`` statement on Python 3.5.
+
 `tornado.template`
 ~~~~~~~~~~~~~~~~~~
 
 * `tornado.template.ParseError` now includes the filename in addition to
   line number.
+* Whitespace handling has become more configurable. The `.Loader`
+  constructor now has a ``whitespace`` argument, there is a new
+  ``template_whitespace`` `.Application` setting, and there is a new
+  ``{% whitespace %}`` template directive. All of these options take
+  a mode name defined in the `tornado.template.filter_whitespace` function.
+  The default mode is ``single``, which is the same behavior as prior
+  versions of Tornado.
 
 `tornado.testing`
 ~~~~~~~~~~~~~~~~~
 
 * `.ExpectLog` objects now have a boolean ``logged_stack`` attribute to
   make it easier to test whether an exception stack trace was logged.
+
+`tornado.web`
+~~~~~~~~~~~~~
+
+* The hard limit of 4000 bytes per outgoing header has been removed.
+* `.StaticFileHandler` returns the correct ``Content-Type`` for files
+  with ``.gz``, ``.bz2``, and ``.xz`` extensions.
+* Responses smaller than 1000 bytes will no longer be compressed.
+* The default gzip compression level is now 6 (was 9).