Apple has been keeping busy rolling out small patches for iOS 6. The latest, iOS 6.1.3 beta 2 just hit developers. Importantly, 9To5Mac reports that the update fixes the gaping lock screen bug that allows access even with out a passcode.
No word on whether it patches up the recent Evasi0n jailbreak. Unfortunately, it's only a developer beta, so you won't get the fix just yet. [9To5Mac]