WordPress have announced that the first release candidate (RC1) for WordPress 3.2 is now available.
With more than 350 tickets closed, there are plenty of changes. Plugin and theme authors, please test your plugins and themes now, so that if there is a compatibility issue, we can figure it out before the final release. Users are also encouraged to test things out. If you find problems, let your plugin/theme authors know so they can figure out the cause.
More info: http://wordpress.org/news/2011/06/wordpress-3-2-release-candidate/