Now that the KitKat update has started rolling out to various Nexus devices, we're, unfortunately, seeing no traces of the Google Experience Launcher, which confirms an earlier report stating as much. No GEL means no transparency in the default and a pretty barebones boring AOSP launcher. It also means no Google Now integration and no "Ok Google" hotword support while on any home screen.
Boring Nexus 7 launcher
However, not all is lost.