Pretty noisy topic, right? Well, this is definitely not a new thing. Rootkits for IOS existed for quite a few years and that is what i told Sean when we talk about my presentation on EuSecWest among some other things.
Remember the news about stolen IOS source code? That definitely helped the bad guys cause reversing and entire IOS image was not necessary anymore... so what do you think the bad guys did with this source code? :P