Now that iOS 7 GM has been officially released, the evad3rs — the team responsible for bringing us the iOS 6 evasi0n jailbreak last winter — have started looking into iOS 7. The team, according to prominent iOS hacker and team member @planetbeing, are now in a reconnaissance phase to see which exploits, if any, still work with iOS 7.
This is being done on existing devices like the iPhone 5, iPhone 4S, etc. The new devices, especially the iPhone 5S with its 64-bit processor, will presumably be another massive hurdle to overcome once they launch later this month. Regardless of what the final outcome may eventually be, this is great news for those of us who would like a jailbreak for iOS 7.