I'm not so sure about that. Hijacking Android like Facebook does it, might mean trouble for Google. Google's revenue comes from advertisement in their products. If you use an app to rebrand the smart phone, so people won't use Google services anymore (and won't see ads), that's very troublesome for Google.

Google is not earning money with Android. Facebook is kind of backstabbing Google, in my opinion.

Looking at the App, I don't get why I should install it or what the advantage is over using the normal Facebook App ... then again I don't use Facebook that much.

We'll see how it will play out.