A note to people interested in the exploit and retaining OtherOS support, DO NOT UPDATE. When 3.21 comes out, I will look into a safe way of updating to retain OtherOS support, perhaps something like Hellcat's Recovery Flasher. I never intended to touch CFW, but if that's how you want to play...
Two things, some people seem to think CFW will enable some sort of piracy. It won't. It'll just be a custom version of 3.21 that doesn't lose OtherOS support. Hacking isn't about getting what you didn't pay for, it's about making sure you do get what you did.
And this is about more than this feature right now. It's about whether these companies have the right to take away advertised features from a product you purchased. Imagine if an exploit were found in Safari on the iPhone, but instead of fixing it, Apple decides to pull web browsing altogether. Legally, they may be within their right to do so, but we have to show them it's the wrong move for the future of the product and the company.
For now, it looks like proxying the query for new firmwares is working. My investigation into 3.21 has begun.