Publish Qt/PyQt update announcement

Author: andfoy

src/user/announcements.rst

@@ -8,6 +8,22 @@ Our announcements are published to an RSS feed `here <https://conda-forge.org/do
 2022
 ----
 
+:2022-04-23: Packages for Qt/PyQt 5.15.2 are now available
+
+    After more than six months, the conda-forge team and contributors have managed
+    to update the Qt5 packages to the latest LTS version, 5.15.2. Major changes include
+    separate packages for QtWebEngine (``qt-webengine``) and the rest of Qt in a new
+    package called ``qt-main``. This allows recipes that do not use any of the
+    WebEngine components to depend only on ``qt-main``, reducing the total size of
+    the downloaded binaries. As a result of this, ``qt`` is now a metapackage that
+    will install both ``qt-main`` and ``qt-webengine`` as dependencies.
+
+    With respect to PyQt, the new packages now are in sync with respect to their
+    corresponding PyPi releases, which means that the ``pyqt`` package will only provide
+    the core components of Qt, leaving ``pyqtwebengine`` and ``pyqtcharts`` as optional
+    packages that extend PyQt by providing the QtWebEngine and QtCharts components,
+    respectively. A migrator will be put in place to help with the transition.
+
 :2022-04-20: New Semi-automated PR Labeling in conda-forge/staged-recipes
 
     A GitHub action now monitors comments on issues in staged-recipes and will add