Fairly certain that if it was listed in the WWDC slides about iOS 9 in general (not about beta specifically) and appears at Apple's own iOS 9 web site at http://www.apple.com/ios/ios9-preview/ (aimed at the public and not specifically about the beta) it would be a pretty big screw up on their part to not release the final version for the listed devices.
It wouldn't be the first time Apple listed a device during a beta only to pull it right before release. IIRC last time it happened was with an iMac few years ago.
Like I said, very strong chance it will support it. But until its GM release ... I wouldn't bet the farm on it.