As I mentioned below and on the disclosure page, it's trivial for Apple to reliably detect this in apps submitted to the App Store and reject them, so I'm not worried. There's no such thing as "obfuscated" malware in the traditional sense on the App Store. You can obfuscate the code flow all you want, but all executable code has to be signed to run on iDevices. If you try to use this register, the instruction will be there for all to see. You can't use self-modifying code or packers on iOS.
Obfuscated malware where the malicious part is not obvious; it's distributed and requires a separate process/image.
Curious to see if some smart Apple-ers can invent a fix for this, though it seems like "no way" given the vulnerability.