- Runtime support for PEP 646, adding `typing_extensions.TypeVarTuple`
  and `typing_extensions.Unpack`.
- Add interaction of `Required` and `NotRequired` with `__required_keys__`,
  `__optional_keys__` and `get_type_hints()`. Patch by David Cabot (@d-k-bo).
- Runtime support for PEP 675 and `typing_extensions.LiteralString`.
- Add `Never` and `assert_never`. Backport from bpo-46475.
- `ParamSpec` args and kwargs are now equal to themselves. Backport from
  bpo-46676. Patch by Gregory Beauregard (@GBeauregard).
- Add `reveal_type`. Backport from bpo-46414.
- Runtime support for PEP 681 and `typing_extensions.dataclass_transform`.
- `Annotated` can now wrap `ClassVar` and `Final`. Backport from
  bpo-46491. Patch by Gregory Beauregard (@GBeauregard).
- Add missed `Required` and `NotRequired` to `__all__`. Patch by
  Yuri Karabas (@uriyyo).
- The `@final` decorator now sets the `__final__` attribute on the
  decorated object to allow runtime introspection. Backport from
  bpo-46342.
- Add `is_typeddict`. Patch by Chris Moradi (@chrismoradi) and James
  Hilton-Balfe (@Gobot1234).

Thank you to all the contributors to the PEPs and to the people who contributed to the typing_extensions implementation!