Android 4.4 KitKat is bringing an update to Google Hangouts that adds SMS support as well as a number of other improvements to the app. We're guessing that the update will likely roll out to other Android handsets sometime about the same time as KitKat hits other Nexus devices, because both are on the timetable of a few weeks. But, there is another feature that users have been asking about: Google Voice support...
Source: http://www.phonearena.com/news/3rd-party-Google-Voice-apps-dying-and-support-is-coming-to-Hangouts-early-next-year_id48987
Source: http://www.phonearena.com/news/3rd-party-Google-Voice-apps-dying-and-support-is-coming-to-Hangouts-early-next-year_id48987