It took a while, but it looks like Apple is finally cracking down on the untethered evasi0n jailbreak with some bug fixes set for inclusion in iOS 6.1.3. Forbes is reporting that David Wang, one of the jailbreak's developers, has tested iOS 6.1.3 Beta 2 and found that it fixes one of five bugs exploited by evasi0n, breaking it in the process.
Wang believes that it may take Apple a month to release iOS 6.1.3 publicly, and says that evad3rs -- the group behind evasi0n -- has uncovered some additional exploits that may allow them to create a new jailbreak that will work on 6.1.3 and subsequent iOS releases