The iOS 6.1.1 beta released yesterday by Apple does not block the Evasi0n jailbreak; however, it is expected to before the final build is released.
Pod2g, a member of the Evad3rs dev-team, tweets:
6.1.1 beta (10B311) does not fix the jailbreak. It'll probably happen in a future revision. Don't upgrade though, evasi0n won't let you jb.
The new firmware features major changes to Japan's Maps but little else.