The iOS 6.1.3 beta 2 has been analyzed by planetbeing (David Wang) and it patches at least one of the five bugs used to jailbreak. Specifically, the flaw in the operating system's time zone settings is no longer there.
The beta update likely signals the end of using evasi0n to hack new or updated devices after the update is released to users, says Wang, who says he’s still testing the patch to see which other vulnerabilities exploited by the jailbreak might no longer exist in the new operating system.
“If one of the vulnerabilities doesn’t work, evasi0n doesn’t work,” Wang said. “We could replace that part with a different vulnerability, but [Apple] will probably fix most if not all of the bugs we’ve used when 6.1.3 comes out.”
Typically, Apple blocks any jailbreak exploits in the next version of its operating system; however, the company was forced to release iOS 6.1.1 and iOS 6.1.2 rapidly due to critical bugs in the release of iOS 6.1.
Planetbeing hasn't had a chance to test the latest beta for all the bugs it might fix.
“If they patch most of the bugs,” Wang says. “Then we’re starting from scratch.”