Before the Nexus 5 and Android 4.4 were officially announced, there was a theory run out by Ron Amadeo that Google might be aiming to decouple the Android launcher under the name Google Experience Launcher, but it turns out while that does look to be true, it isn't happening exactly how we expected. As we were playing with the Nexus 5, we noticed that the launcher seemed to be connected to the Google Search app. When we did a bit of digging, it turns out that none other than Mr. Amadeo has already sussed out the deeper connection here...
Source: http://www.phonearena.com/news/The-Google-Experience-launcher-isnt-new-its-the-Google-Search-app_id49047
Source: http://www.phonearena.com/news/The-Google-Experience-launcher-isnt-new-its-the-Google-Search-app_id49047