I bet it will be out sometime next year. I'm hoping the next iOS update will have Siri with full iOS integration. Maybe a few updates here & there up until then. Pure hopefulness though.
It doesn't really make a difference wether it is beta or not. It still works on the 4S and even if it wasn't in beta I doubt it will be taken to older devices. Apple could of said it wasn't a beta and it wouldn't have made a difference really.