WordPress 3.2 is releasing very soon!, the dev team posted the minimum requirements for the latest upcoming version:
"As of 3.2, you'll need to be running PHP 5.2.4 and MySQL 5.0. -- make sure you're running compatible versions of PHP and MySQL before you update tomorrow when WordPress 3.2 is released."
"Log in to your hosting account, and check to make sure you have at least PHP 5.2.4 and MySQL 5.0. Most of the major hosts already default to these or newer versions, but there are some exceptions. Check to see which versions you are running, and if you're still on an older version, it should be as simple as changing a dropdown menu and clicking Save to get up to date."
If you don't know how to find this information in your hosting account or you don't even know how to access your hosting control panel, don't fret. You can find out if you're ready for 3.2 with the Health Check plugin. In your dashboard, go to Plugins ? Add New and search for "health check" (it should be the first result). Install it, activate it, and it'll tell you if you need to update anything.
Also, note, with 3.2, the Internet Explorer 6, will no longer be supported. "From now on, if you access your WordPress dashboard from an outdated browser, you'll see a friendly orangey-yellow box in your dashboard letting you know you a newer version is available (which you can dismiss, of course). If you're using IE6, though, the "box will be red, and your dashboard will not function properly," explained dev team.