Not being nasty, if you take it that way, that's on you.
There have been numerous features demoed at WWDC over the years that come in a 0.X release, rather than an X.0 release and more of those have been in later release for other countries. This gives time for Devs to prepare for what's to come and be ready, and yes, to TALK about those features. Also, things always change between WWDC and the launch anyway, always have, always will.
The point is, it wasn't said it was coming when iOS 9 launched, so not technically wrong and technically is what matters.