DOC: update release.rst for 0.15.0

Author: jreback

doc/source/release.rst

@@ -58,17 +58,22 @@ Highlights include:
 - Drop support for numpy < 1.7.0 (:issue:`7711`)
 - The ``Categorical`` type was integrated as a first-class pandas type, see :ref:`here <whatsnew_0150.cat>`
 - New scalar type ``Timedelta``, and a new index type ``TimedeltaIndex``, see :ref:`here <whatsnew_0150.timedeltaindex>`
+- New DataFrame default display for ``df.info()`` to include memory usage, see :ref:`Memory Usage <whatsnew_0150.memory>`
 - New datetimelike properties accessor ``.dt`` for Series, see :ref:`Datetimelike Properties <whatsnew_0150.dt>`
 - Split indexing documentation into :ref:`Indexing and Selecting Data <indexing>` and :ref:`MultiIndex / Advanced Indexing <advanced>`
+- Split out string methods documentation into :ref:`Working with Text Data <text>`
 - ``read_csv`` will now by default ignore blank lines when parsing, see :ref:`here <whatsnew_0150.blanklines>`
 - API change in using Indexes in set operations, see :ref:`here <whatsnew_0150.index_set_ops>`
 - Internal refactoring of the ``Index`` class to no longer sub-class ``ndarray``, see :ref:`Internal Refactoring <whatsnew_0150.refactoring>`
 - dropping support for ``PyTables`` less than version 3.0.0, and ``numexpr`` less than version 2.1 (:issue:`7990`)
-- Refactor ``Index`` to no longer subclass ``ndarray`` See :ref:`Internal Refactoring <whatsnew_0150.refactoring>`
 
-See the :ref:`v0.15.0 Whatsnew <whatsnew_0140>` overview or the issue tracker on GitHub for an extensive list
+See the :ref:`v0.15.0 Whatsnew <whatsnew_0150>` overview or the issue tracker on GitHub for an extensive list
 of all API changes, enhancements and bugs that have been fixed in 0.15.0.
 
+This is a major release from 0.14.1 and includes a small number of API changes, several new features,
+enhancements, and performance improvements along with a large number of bug fixes. We recommend that all
+users upgrade to this version.
+
 Thanks
 ~~~~~~