The next release candidate for WordPress 4.1 is now available for testing.
To test, try the WordPress Beta Tester plugin (you’ll want “bleeding edge nightlies”). Or you can download the release candidate here (zip). If you’d like to learn more about what’s new in WordPress 4.1, visit the updated About screen in your dashboard ( → About in the toolbar) and also check out the Beta 1 post.
Plugin authors: Remember to test your plugins against 4.1, and if they’re compatible, make sure they are marked as tested up to 4.1. Be sure to follow along the core development blog; we’ve been posting notes for developers for 4.1 as always.