Again with the Google! This time it's GV Mobile (short for Google Voice, the re-branded Grand Central service) and the above video comes courtesy of Sean Kovacs.

If it's a correct reflection of what we'll see when/if GV Mobile hits the App Store, then it seems to be focused primarily on using Google Voice to make almost Skype-like calls. Google Voice is, of course, far more than a simple calling service, so you also get SMS sending (receiving is handled via the built-in, default iPhone SMS/Messages app), as well as voicemail.

So, is this the Google Voice goodness you've been waiting for?