The benefit will probably go first to someone like Apple or Google who can both supply streaming content and control the software (and ideally hardware) on devices (I imagine for low-powered devices you'll want hardware decoding, so this will prevent Apple from, say, adding support to existing AppleTVs).
I guess we can all complain when the iPhone 5 doesn't support it.
Google is heavily pushing VP8, which is supposedly royalty free. I'd be incredibly impressed if Apple could make a hardware decoder/encoder for HEVC for their next iPhone (or whichever one comes after the standard is finalised), but we won't know until then :)
http://www.webmproject.org/tools/vp8-sdk/
It will be interesting to see what happens with VP8/WebM. Really it looks like Google tried to stymie Apple (which committed itself to H264) first by trying to back Adobe/Flash and then VP8 (and announcing that H264 support would be dropped from Chrome, which AFAIK it hasn't been on any platform). Thus far I don't see VP8 achieving much and Google may just end up sticking with MPEG standards.
IIRC the PowerVR GPU inside all the iOS devices already support hardware VP8 encoding/decoding.
Apple just has no inclination to support it. And why would they ? VP8 is significantly worse than H.264 in every important way (quality, compatibility, popularity). Not to mention that Apple is on a very anti-Google path right now.
I guess we can all complain when the iPhone 5 doesn't support it.