iPhone 6 FaceTime Now Supports H.265. Where Is VP9 for WebRTC?

Does anyone know the significance of the very specific wording found in the iPhone 6 specs page?:

"FaceTime over cellular uses H.264/H.265" (on US site)

"FaceTime over a mobile network uses H.264/H.265" (on UK site)

Why would they specify "mobile/cellular"? The only thing I could think of was that the extra compression was worth the trade-offs in battery usage in that case due to the limited bandwidth?

Also, it looks like VP9 support may have landed (and been reverted?) into Google's WebRTC codebase in the last week or so:

https://webrtc-codereview.appspot.com/27779004