A fresh WordPress 3.2 is available. It has some good new features, but it will cause a deeper impact because henceforth WordPress will not work with PHP 4 and MySQL 4. This has been in works, Mark Jaquith had announced this a year back. Most of the hosts have PHP 5 ready, but I know at least a couple of hosting companies who are now forcing their users to move off PHP 4 and upgrade to PHP 5 because of WordPress’ changed requirements.
This might require some action on your part. The Codex has a detailed article on switching to PHP 5. Some hosts have implemented PHP 5 using CGI to host PHP 4 and PHP 5 together. Backup your
.htaccess in case they are overwritten during the upgrade. This upgrade will not be much different than the previous ones, but you will have to be a tad bit more careful about your hosting environment.
Along with a full-screen editor, WordPress’ default theme is now a HTML 5 theme. These new upgrades mean that WordPress has dropped support for IE 6 and started end of life cycle for IE 7. Upgrade and enjoy the new WordPress.