Instead of answering the question, Pod2g explained he is working actively to find iOS 5.1 vulnerabilities to bring untethered jailbreak for the latest Apple mobile software.
Pod2G was the guy who brought iOS 5 / 5 untethered jailbreak for A4 devices (Corona and Redsn0w) and for A5 device (Absinthe). Now the same guy is trying his luck and pouring his skill to conquer the iOS 5.1 security wall and then bring jailbreak utility for all of us to use. Anyway here is his tweet screenshot.
As for A4 device users who have updated to iOS 5.1, you can semi untethered jailbreak your iOS 5.1 device using Redsn0w 0.9.10B6.