Yes. There are many people that know for sure. The question has been asked of AT&T. They explicitly said the new contract starts when you activate it. It does not add 2 more years to your current contract. Call them yourself and see. Having said that, I will agree nothing's 100% until it happens. But, I have no worries whatsoever about this being wrong. If I did, I wouldn't by typing this - I would be on the phone tracking down the several [AT&T] specialists who verified this info.
I did call. I got explicitly told all sorts of things, including I would need to pay to break my contract and also it would extend my contract 2 more years. Others have posted similar reports in this same thread. By your own admission, you're not calling, so you don't know what ATT is saying.
Personally, I don't want to waste my time blissfully waiting in line Friday to find out what I assumed isn't true. It seems what we all hope is true, which is great, but there is still mixed messages coming out of ATT, which keeps this issue from go away.