"So looks like all my A5(X) devices are fully untethered and jailbroken for life now. :)" iH8sn0w, the developer behind Sn0wBreeze and other jailbreak apps, tweeted this afternoon. The comment has caused quite a bit of excitement, as we haven't seen anything like this in jailbreaking since LimeRa1n.
iH8sn0w says he doesn't have a bootrom exploit though, but rather a "powerful iBoot exploit." And although it doesn't look like he's going to do anything with it right now in terms of a public release, it sounds like he'll be able to use the exploit in future jailbreaks, and to find similar bugs in A6/A7 chips...