diff --git a/doc/source/whatsnew/index.rst b/doc/source/whatsnew/index.rst
index 6c14a2e784236..352c7ec745067 100644
--- a/doc/source/whatsnew/index.rst
+++ b/doc/source/whatsnew/index.rst
@@ -10,13 +10,13 @@ This is the list of changes to pandas between each release. For full details,
 see the `commit logs <https://github.com/pandas-dev/pandas/commits/>`_. For install and
 upgrade instructions, see :ref:`install`.
 
-Version 1.6
+Version 2.0
 -----------
 
 .. toctree::
    :maxdepth: 2
 
-   v1.6.0
+   v2.0.0
 
 Version 1.5
 -----------
diff --git a/doc/source/whatsnew/v1.6.0.rst b/doc/source/whatsnew/v2.0.0.rst
similarity index 95%
rename from doc/source/whatsnew/v1.6.0.rst
rename to doc/source/whatsnew/v2.0.0.rst
index a2c77715aa46d..9d1e0c7485092 100644
--- a/doc/source/whatsnew/v1.6.0.rst
+++ b/doc/source/whatsnew/v2.0.0.rst
@@ -1,30 +1,30 @@
-.. _whatsnew_160:
+.. _whatsnew_200:
 
-What's new in 1.6.0 (??)
+What's new in 2.0.0 (??)
 ------------------------
 
-These are the changes in pandas 1.6.0. See :ref:`release` for a full changelog
+These are the changes in pandas 2.0.0. See :ref:`release` for a full changelog
 including other versions of pandas.
 
 {{ header }}
 
 .. ---------------------------------------------------------------------------
-.. _whatsnew_160.enhancements:
+.. _whatsnew_200.enhancements:
 
 Enhancements
 ~~~~~~~~~~~~
 
-.. _whatsnew_160.enhancements.enhancement1:
+.. _whatsnew_200.enhancements.enhancement1:
 
 enhancement1
 ^^^^^^^^^^^^
 
-.. _whatsnew_160.enhancements.enhancement2:
+.. _whatsnew_200.enhancements.enhancement2:
 
 enhancement2
 ^^^^^^^^^^^^
 
-.. _whatsnew_160.enhancements.other:
+.. _whatsnew_200.enhancements.other:
 
 Other enhancements
 ^^^^^^^^^^^^^^^^^^
@@ -39,14 +39,14 @@ Other enhancements
 -
 
 .. ---------------------------------------------------------------------------
-.. _whatsnew_160.notable_bug_fixes:
+.. _whatsnew_200.notable_bug_fixes:
 
 Notable bug fixes
 ~~~~~~~~~~~~~~~~~
 
 These are bug fixes that might have notable behavior changes.
 
-.. _whatsnew_160.notable_bug_fixes.notable_bug_fix1:
+.. _whatsnew_200.notable_bug_fixes.notable_bug_fix1:
 
 :meth:`.GroupBy.cumsum` and :meth:`.GroupBy.cumprod` overflow instead of lossy casting to float
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -76,18 +76,18 @@ We return incorrect results with the 6th value.
 
 We overflow with the 7th value, but the 6th value is still correct.
 
-.. _whatsnew_160.notable_bug_fixes.notable_bug_fix2:
+.. _whatsnew_200.notable_bug_fixes.notable_bug_fix2:
 
 notable_bug_fix2
 ^^^^^^^^^^^^^^^^
 
 .. ---------------------------------------------------------------------------
-.. _whatsnew_160.api_breaking:
+.. _whatsnew_200.api_breaking:
 
 Backwards incompatible API changes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-.. _whatsnew_160.api_breaking.deps:
+.. _whatsnew_200.api_breaking.deps:
 
 Increased minimum versions for dependencies
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -112,7 +112,7 @@ Optional libraries below the lowest tested version may still work, but are not c
 
 See :ref:`install.dependencies` and :ref:`install.optional_dependencies` for more.
 
-.. _whatsnew_160.api_breaking.other:
+.. _whatsnew_200.api_breaking.other:
 
 Other API changes
 ^^^^^^^^^^^^^^^^^
@@ -125,7 +125,7 @@ Other API changes
 -
 
 .. ---------------------------------------------------------------------------
-.. _whatsnew_160.deprecations:
+.. _whatsnew_200.deprecations:
 
 Deprecations
 ~~~~~~~~~~~~
@@ -133,7 +133,7 @@ Deprecations
 -
 
 .. ---------------------------------------------------------------------------
-.. _whatsnew_160.performance:
+.. _whatsnew_200.performance:
 
 Performance improvements
 ~~~~~~~~~~~~~~~~~~~~~~~~
@@ -160,7 +160,7 @@ Performance improvements
 - Performance improvement in :class:`DataFrameGroupBy` and :class:`SeriesGroupBy` when ``by`` is a categorical type and ``sort=False`` (:issue:`48976`)
 
 .. ---------------------------------------------------------------------------
-.. _whatsnew_160.bug_fixes:
+.. _whatsnew_200.bug_fixes:
 
 Bug fixes
 ~~~~~~~~~
@@ -297,7 +297,7 @@ Other
 -
 
 .. ---------------------------------------------------------------------------
-.. _whatsnew_160.contributors:
+.. _whatsnew_200.contributors:
 
 Contributors
 ~~~~~~~~~~~~
diff --git a/pandas/core/generic.py b/pandas/core/generic.py
index 3149cbb87c16e..ce828ba4a0af4 100644
--- a/pandas/core/generic.py
+++ b/pandas/core/generic.py
@@ -4650,7 +4650,7 @@ def add_prefix(self: NDFrameT, prefix: str, axis: Axis | None = None) -> NDFrame
         axis : {{0 or 'index', 1 or 'columns', None}}, default None
             Axis to add prefix on
 
-             .. versionadded:: 1.6.0
+             .. versionadded:: 2.0.0
 
         Returns
         -------
@@ -4724,7 +4724,7 @@ def add_suffix(self: NDFrameT, suffix: str, axis: Axis | None = None) -> NDFrame
         axis : {{0 or 'index', 1 or 'columns', None}}, default None
             Axis to add suffix on
 
-             .. versionadded:: 1.6.0
+             .. versionadded:: 2.0.0
 
         Returns
         -------
diff --git a/pandas/tests/series/methods/test_isin.py b/pandas/tests/series/methods/test_isin.py
index 0eca3e0512849..449724508fcaa 100644
--- a/pandas/tests/series/methods/test_isin.py
+++ b/pandas/tests/series/methods/test_isin.py
@@ -57,10 +57,6 @@ def test_isin_datetimelike_mismatched_reso(self):
         result = ser.isin(dta)
         tm.assert_series_equal(result, expected)
 
-    @pytest.mark.xfail(
-        reason="DTA._from_sequence incorrectly treats Timestamp[s].value as "
-        "nanoseconds."
-    )
     def test_isin_datetimelike_mismatched_reso_list(self):
         expected = Series([True, True, False, False, False])