The only thing I can confirm is that the new Halo 3 achievements will be released on or around September 25th. I'm not saying I believe this rumor but like the original post said a lot of things would make sense.
Well I guess we'll just stay tuned and wait. I can't imagine Microsoft would make THAT huge of a deal on something like this that could go wrong and crash and then they'd look like assoles.
I'm excited if it is true though. Not getting my hopes up.