The wonderful devs who jailbreak iPhones have appeared to have already jailbroken the iPhone 5. Yes, the iPhone 5 that just came out today. According to Grant Paul aka chpwn on the jailbreak scene, he's already got Cydia—the de facto jailbreak App Store—running on the new iPhone.
However, just because devs have tapped into the iPhone 5 already, it doesn't mean a public availability for a jailbreak for regular joe schmo is imminent. There's still a lot of kinks to figure out. But of course it doesn't hurt to have a talented dev already crack the iPhone 5 and load Cydia onto it only a few hours after the phone's been released. So stay tuned, we'll definitely be keeping you updated on the jailbreak status of the iPhone 5. [@chpwn]