More elegant: leak the OS build itself, so that the specific attack vector they warned about comes to pass.

You don't think Apple has extreme protections around their signing key?

Eh, probably just sitting on a USB key on Tim Cook's desk with a Post-It note attached saying "DO NOT LOSE".

I'm also guessing that they routinely send out to Kinko's to get copies of the source code / signing key printed out for backup.

(sarcasm)