Add initial changelog entries for 1.17 (#19200)

Author: cdce8p

CHANGELOG.md

@@ -2,6 +2,27 @@
 
 ## Next Release
 
+### Remove Support for targeting Python 3.8
+
+Mypy now requires `--python-version 3.9` or greater. Support for only Python 3.8 is
+fully removed now. Given an unsupported version, mypy will default to the oldest
+supported one, currently 3.9.
+
+This change is necessary because typeshed stopped supporting Python 3.8 after it
+reached its End of Life in October 2024.
+
+Contributed by Marc Mueller
+(PR [19157](https://github.com/python/mypy/pull/19157), PR [19162](https://github.com/python/mypy/pull/19162)).
+
+### Initial Support for Python 3.14
+
+Mypy is now tested on 3.14 and mypyc works with 3.14.0b3 and later.
+Mypyc compiled wheels of mypy itself will be available for new versions after 3.14.0rc1 is released.
+
+Note that not all new features might be supported just yet.
+
+Contributed by Marc Mueller (PR [19164](https://github.com/python/mypy/pull/19164))
+
 ### Deprecated Flag: \--force-uppercase-builtins
 
 Mypy only supports Python 3.9+. The \--force-uppercase-builtins flag is now deprecated and a no-op. It will be removed in a future version.