It's not really about to come out. That's not until the fall. They'll do a preview June 8th and I'm sure beta (developer and those who have access to public) will start within a few weeks after that. I'm sure a iOS 9 section will start then. I believe the iOS 8 section started last year when the developer beta began.
Should we have an iOS10 section too? It makes sense to have a new forum when the betas start and not before IMO. We can make reference to future products without them needing their own subsection.
Of course it makes sense. No one knows anything about iOS 9 officially. So why have a section when everything is all rumours. Makes sense to me not to have one till at least we see the preview at the event in June and have actual fact on it. But that's my opinion.