Following the public release of iOS 6.1.2, Apple has seeded the 6.1.3 beta to registered developers. Apple seeded the first iOS 6.1.1 beta towards the beginning of this month, and the minor release of 6.1.2 has caused the jump to 6.1.3 “beta 2.”
A crazy security flaw in the iOS lockscreen was recently discovered that could bypass a passcode, and Apple says it has patched the bug in this developer beta. There are also improvements to Maps in Japan.
Source: Apple