I read a few pages and while I think it's way out there that they would swap the processor for a dual-core, here's a couple reasons FOR doing it:
1. Obviously, it's what's needed to keep it as a top-of-the-line phone for more than three months.
2. I hear that battery life is a problem. If they haven't found any other solutions via the software or battery itself, maybe a dual-core will help on battery life and prompt them to delay the phone and make it work.
I apologize if my second point has already been put out there. Just my two cents...
Phil already stated dual out of the question a couple pages ago