Thanks for the clear write-up, d-hubs. The reminder that Beta 4 is for testing and development environments only is important, because people sometimes forget that.
I like that you listed the WordPress Playground option. Being able to try the beta in the browser without any setup or risk makes it much easier for people who don’t have a test server to take part.
The selective language updates sound useful. Being able to install individual translation updates, the way you do with plugins and themes, should make multilingual sites much easier to manage. I’m also glad to see the accessibility work, especially keyboard focus in high-contrast mode and the clearer focus indicators in the new Ipsum theme.
One question for anyone who has already tried it: how does Beta 4 behave with older plugins? That’s usually where problems show up first, so I’d be interested to hear what people find.
Thanks again for sharing the resources and the testing options.