During the last night Apple launched iOS 6.1.1 for iPhone 4S and shortly after the event I told you that evasi0n was updated, and now it works untethered jailbreak for that device, on that version of iOS. Version 1.3 of the solution untethered jailbreak it does not bring any other news apart from compatibility with this version of iOS, but unfortunately compatibility is limited to iPhone 4S only, so don't expect anything else. You can download evasion 0 from here : Windows, Mac OS X, Linux. Jailbreak tutorial using evasi0n find here, the procedure remaining the same.
