I just released typing-extensions 4.4.0, which adds support for several draft PEPs that are being considered for Python 3.12 and for subclassing Any at runtime. Changelog:

- Add `typing_extensions.Any` a backport of python 3.11's Any class which is
  subclassable at runtime. (backport from python/cpython#31841, by Shantanu
  and Jelle Zijlstra). Patch by James Hilton-Balfe (@Gobot1234).
- Add initial support for TypeVarLike `default` parameter, PEP 696.
  Patch by Marc Mueller (@cdce8p).
- Runtime support for PEP 698, adding `typing_extensions.override`. Patch by
  Jelle Zijlstra.
- Add the `infer_variance` parameter to `TypeVar`, as specified in PEP 695.
  Patch by Jelle Zijlstra.