Turned my N5 phone on this morning and after an hour I noticed that the launcher has been updated slightly. The google search bar now appears on the Google Now screen. Before this bar would slide out of view when you swiped left to view Google Now and then slide into view when you swiped right.
Also see that the app drawer background is different. It use to be black, now the background is a dimmed view of your wall paper. In other words your wall paper shines though to the app drawer background. I guess you say that the background is opaque.
Nice change to the app drawer background, don't really care about the google search bar.
If anyone notices any other changes please let us know.