Also note: Vue 3 does not support IE11 (RFC | Discussion).
Supporting Libraries
All of our official libraries and tools now support Vue 3, but most of them are still in beta status and distributed under the next dist tag on NPM. We are planning to stabilize and switch all projects to use the latest dist tag in early 2021.
Vue CLI
As of v4.5.0, vue-cli now provides built-in option to choose Vue 3 preset when creating a new project. You can upgrade vue-cli and run vue create to create a Vue 3 project today.
Vue Router
Vue Router 4.0 provides Vue 3 support and has a number of breaking changes of its own. Check out its Migration Guide for full details.
We are working on a new version of the Devtools with a new UI and refactored internals to support multiple Vue versions. The new version is currently in beta and only supports Vue 3 (for now). Vuex and Router integration is also work in progress.
Note: the beta channel may conflict with the stable version of devtools so you may need to temporarily disable the stable version for the beta channel to work properly.