They're not done yet. According to my G+ stream, Amit Singhal has announced that Hangouts is also going to be the future of Google Voice. And apparently you ca

They're not done yet. According to my G+ stream, Amit Singhal has announced that Hangouts is also going to be the future of Google Voice. And apparently you can already choose to get SMS messages from Hangouts when you are idle. A less important piece of SMS integration, to be sure, but that certainly looks like a starting point.