It was released "officially" today. (11/09/2004).
I don't know exactly what's changed as it looks just like the Public Review to me.
I use it once in a while, I mostly use IE since SP2 though, it does a good job now. One of the main reasons I don't use Opera is it's not FREE. Sure, I could crack it and then I wouldn't have to look Advertisments, but why do that, when I can choose between two free browsers that work just as good?