WordPress 3.5 is set to be released momentarily. As always, you’ll want to update your WordPress website to this new release as soon as possible.
If you’re not a fan of mysteries when it comes to software updates, spend six minutes watching this video and you’ll know what to expect when you upgrade to WordPress 3.5.
Note: I demonstrate the new Media Upload page in this screencast. Just moments after this was recorded the WordPress development team released a new version with a slightly redesigned screen. Conceptually, the two are the same (and very different from the old way of doing things). The WordPress Essentials course has already been updated for WordPress 3.5, including updates reflecting the new media upload page.