As announced on https://wordpress.org/news/2017/10/wordpress-4-9-beta-2
WordPress 4.9 Beta 2 is now available.
This software is still in development, so WordPress.org does not recommend you run it on a production site. Consider setting up a test site just to play with the new version. To test WordPress 4.9, try the WordPress Beta Tester plugin (you’ll want “bleeding edge nightlies”). Or you can download the beta here (zip).
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If you think you’ve found a bug, you can post to the Alpha/Beta area in the support forums. We’d love to hear from you! If you’re comfortable writing a reproducible bug report, file one on WordPress Trac, where you can also find a list of known bugs.
Let’s test all of these: code editing, theme switches, widgets, scheduling.
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