I have a Dell latitude E6530 laptop with NVidia video card that was working fine with the default video driver.
After a normal package update (~1 week ago) and a restart, boot resulted in a blank screen and I could run Ubuntu only with safe mode.
In safe mode all my "cool" shortcuts were disabled. i.e.
ctrl+Super+ LeftKey Ctri+Super+ RightKey Ctrl+Alt+Numpad  Super+w and Alt+Tab had a very flat design (I think I was switched to Unity2D)
I managed to restore normal boot by installing the nvidia driver (nvidia-current) and reinstalling X11. However the shortcuts were not restored and I am still in Unity 2D.
I cannot even see these shortcuts in the system preferences anymore so I am not sure if Ubuntu decided to ditch them completely or I can restore them in another way