well its just a rumour by me.
i cant post links yet.... go to gametrailers . c o m / video / gc-09-dj-hero/54596
as you can see in the above video its in 3D (the red and green things)
and its direct footage from the game.
as you can see the ERSB message is not in 3d, only the ingame footage.
so what do you think?