Over the last few weeks there's been a slight buzz about a so-called iPhone 5 jailbreak from some unknown and unproven entity. So as not to draw attention to the folks behind what is almost assuredly a hoax, we'll refrain from linking or name dropping.
The bottom line is this, if you don't see word from a respectable member of the community, a member from proven teams like the Chronic Dev Team or the iPhone Dev Team, then it's almost always fake. Please don't get hyped up over something that isn't real, only to be highly disappointed in a few weeks...