I heard that too, that the full version with all the singers would be played later on, but so far, nope. I wasn't happy with it anyways...it's all R&B, rap, and weird singing, with the exception of a few singers.
and omg, I LOVE that version of "Hallelujah"...I hope we can download that. The lights, music and everything was stunning.
My favorite so far though has to be "Both Sides Now" with the boy in the harness.