That Google search thing is really disturbing. The Android home screen is literally google search now. It looks the same but any app you run, any number you call or person you message is run through the google search APK. Oh and they`re apparently going to be putting ads into the interface at some point, in the phone I already paid for. Thanks Google, do no evil indeed.
You DO realize that Google wrote the entire OS, right? Their code literally processes every action you take on the phone. They don't need to try to sneak anything in to the home screen. If they wanted to know how many times a day you run a Fart app, they would already know.