Wow, Jailbreaking is getting dangerous, that is if you don't have common sense or your not checking the site on the official Jailbreak. This site claims that they have the SHAtter Exploit, used by the Chronic Dev Team, and that you can Jailbreak your 4.X device. All this site will do is steal your passwords and probably leave you unhappy.
This is a message to everyone so that you stay away from fake sites. If you like Jailbreaking, unlocking, etc. I would never update before there is an official Jailbreak out for that firmware. Stay away from scam sites and Apple updates until there is official word.