With the latest GreenPois0n release, we are now able to jailbreak the latest iOS update, iOS 4.2.1. All iDevices including the Verizon iPhone, iPad, iPod Touch and now Apple TV 2, can undergo untethered jailbreaking. The latest GreenPois0n, RC6, can be applied over RC5 and will fix general bugs with the emulators.
[via OSXDaily]