See the 📣 Announcing Dash Dev Tools thread for more info.
Here are the CHANGELOG references for other features and fixes:
- dash: https://github.com/plotly/dash/blob/master/CHANGELOG.md
- dash-renderer: https://github.com/plotly/dash-renderer/blob/master/CHANGELOG.md
- dash-core-components: https://github.com/plotly/dash-core-components/blob/master/CHANGELOG.md
- dash-html-components: https://github.com/plotly/dash-html-components/blob/master/CHANGELOG.md