It looks like Geohot, the iPhone hacking expert who had released popular tools to jailbreak and unlock iPhone like blackra1n, blacksn0w is back.
Geohot had abandoned the jailbreaking scene in July but he seems to be back with a bang. He has discovered a new new bootrom exploit, which he is calling limera1n.
He has published a photo on the limera1n site of 4 devices displaying the limera1n logo.