Add Deprecation Roadmap to backward compatibility document

doc/en/backwards-compatibility.rst

@@ -10,3 +10,89 @@ With the pytest 3.0 release we introduced a clear communication scheme for when
 To communicate changes we are already issuing deprecation warnings, but they are not displayed by default. In pytest 3.0 we changed the default setting so that pytest deprecation warnings are displayed if not explicitly silenced (with ``--disable-pytest-warnings``).
 
 We will only remove deprecated functionality in major releases (e.g. if we deprecate something in 3.0 we will remove it in 4.0), and keep it around for at least two minor releases (e.g. if we deprecate something in 3.9 and 4.0 is the next release, we will not remove it in 4.0 but in 5.0).
+
+
+Deprecation Roadmap
+-------------------
+
+This page lists deprecated features and when we plan to remove them. It is important to list the feature, the version where it got deprecated and the version we plan to remove it.
+
+Following our deprecation policy, we should aim to keep features for *at least* two minor versions after it was considered deprecated.
+
+
+Future Releases
+~~~~~~~~~~~~~~~
+
+3.4
+^^^
+
+**Old style classes**
+
+Issue: `#2147 <https://github.com/pytest-dev/pytest/issues/2147>`_.
+
+Deprecated in ``3.2``.
+
+4.0
+^^^
+
+**Yield tests**
+
+Deprecated in ``3.0``.
+
+**pytest-namespace hook**
+
+deprecated in ``3.2``.
+
+**Marks in parameter sets**
+
+Deprecated in ``3.2``.
+
+**--result-log**
+
+Deprecated in ``3.0``.
+
+See `#830 <https://github.com/pytest-dev/pytest/issues/830>`_ for more information. Suggested alternative: `pytest-tap <https://pypi.python.org/pypi/pytest-tap>`_.
+
+**metafunc.addcall**
+
+Issue: `#2876 <https://github.com/pytest-dev/pytest/issues/2876>`_.
+
+Deprecated in ``3.3``.
+
+**pytest_plugins in non-toplevel conftests**
+
+There is a deep conceptual confusion as ``conftest.py`` files themselves are activated/deactivated based on path, but the plugins they depend on aren't.
+
+Issue: `#2639 <https://github.com/pytest-dev/pytest/issues/2639>`_.
+
+Not yet officially deprecated.
+
+**passing a single string to pytest.main()**
+
+Pass a list of strings to ``pytest.main()`` instead.
+
+Deprecated in ``3.1``.
+
+**[pytest] section in setup.cfg**
+
+Use ``[tool:pytest]`` instead for compatibility with other tools.
+
+Deprecated in ``3.0``.
+
+Past Releases
+~~~~~~~~~~~~~
+
+3.0
+^^^
+
+* The following deprecated commandline options were removed:
+
+  * ``--genscript``: no longer supported;
+  * ``--no-assert``: use ``--assert=plain`` instead;
+  * ``--nomagic``: use ``--assert=plain`` instead;
+  * ``--report``: use ``-r`` instead;
+
+* Removed all ``py.test-X*`` entry points. The versioned, suffixed entry points
+  were never documented and a leftover from a pre-virtualenv era. These entry
+  points also created broken entry points in wheels, so removing them also
+  removes a source of confusion for users.