GrandCentral - One Ring to rule them ALL?

Has Google gone too far with the purchase of GrandCentral? "One number that rings all your phones" (and in the darkness binds them?) There are already great privacy concerns with google. This new acquisition I am SURE will lead to more worries. The idea with grandcentral is that you have a unified inbox for voicemail. All of your voicemail can be accessed in one place. You can get voicemail notifications via sms or email. You can screen calls it looks like, you can have incoming calls ring specific phones depending on who's calling... it sounds like there are some interesting features including (of course) managing it all online. The service is currently in beta and is taking "reservations" for YOUR unified phone number.