-**Remove the old deprecated installer and the corresponding setting `experimental.new-installer`** ([#7356](https://github.com/python-poetry/poetry/pull/7356)).
-**Introduce `priority` key for sources and deprecate flags `default` and `secondary`** ([#7658](https://github.com/python-poetry/poetry/pull/7658)).
- Deprecate `poetry run <script>` if the script was not previously installed via `poetry install` ([#7606](https://github.com/python-poetry/poetry/pull/7606)).
- Deprecate `poetry run <entry point>` if the entry point was not previously installed via `poetry install` ([#7606](https://github.com/python-poetry/poetry/pull/7606)).
- Only write the lock file if the installation succeeds ([#7498](https://github.com/python-poetry/poetry/pull/7498)).
- Do not write the unused package category into the lock file ([#7637](https://github.com/python-poetry/poetry/pull/7637)).
