WordPress 3.6 has been released and has already been downloaded over 40,000 times since it was announced 2 hours ago! All users can now safely update from Dashboard -> Updates or download and update manually, though you should probably backup first just in case, unless you’re already using VaultPress, which you really should be.
If you’re a WordPress.com blogger, you have nothing to worry about, as you’ve technically been running WordPress 3.6 for a while now. Sometimes it’s just cooler to be on the bleeding edge. 😉