Did Google update GV to let you make voice calls from the app? For a long time, this was an iOS-only feature.
No. I just set GrooveIP not to auto update on my phone.
Also this thread that was about Windows Phone has kinda turned into Android as well....
No one knows what's up at the moment.
Yes you can use the Google Voice app for Texting over either the Phone's SMS or over Data/Wifi and calling over the phone's voice network only. Also checking for voicemail over Data/Wifi yet.
At the moment you cannot make calls over Data/Wifi with the Hangouts app on Android until an update. It's coming, just was released on iOS first.
Also supposedly all the stuff in the seperate Google Voice app will be merged into Hangouts and while Hangouts does support SMS it's over the phones SMS network and not over Data/Wifi.