WordPress 3.2, was released on July 4, 2011 and is a major release that adds:
making WordPress faster and lighter
a refreshed dashboard design
the fully HTML5 new Twenty Eleven theme
the new distraction-free writing or zen mode
WordPress 3.2.1, was released on July 12, 2011 and is a maintenance release that fixes a server incompatibility related to JSON, as well as a few other fixes in the new dashboard design and the Twenty Eleven theme. Upgrading is recommended.