The jailbreak thus far comes via well-known iOS hacker MuscleNerd, who Tweeted two images of a jailbroken "new iPad" on Friday. He was quick to add, however, that there is no ETA for an official release of the jailbreak, though.
released in late January.
MuscleNerd was also among the first to jailbreak the iPhone 4S, about two weeks after it was first introduced, although that, like this one, was a preliminary jailbreak with no ETA and a caveat of "much work to be done" attached to it.
It's also clear, though, by looking at sites such as the iPhone Dev Team's that there has been a slowdown in jailbreaking activities, as Apple has managed to make jailbreaking new hardware and new iOS versions more and more difficulty.