Dunno about the floating city thing, looks like bullshit.

The New Year celebrations look like augmented reality to me... though hologram tech is already sophisticated, to the best of my knowledge it's still limited by needing a pane of glass or glass like material with a sheet of OLEDs re: Hatsune Miku concerts.

We have videos of animals and children trying to play with them too, but it's something one would have to see in person to believe as AR is really easy to achieve.