Great video by The Verge on Googles new plan of attack for hangouts… and then it happens at 5:37. Google announces they are moving away from an open standard to their own proprietary code base for their communication platform. Google always champions “open” but rarely is when it is something the company takes seriously. Some examples could be their custom software that runs in their custom data centers on their own custom servers, or their search algorithm, or the lack of ability for people to have an easy and friendly non-google search engine indexible google+ url initially.
I guess this just goes to reiterate the point made in the video that Google is actually considering hangouts to be a core property.