Cadillac CTS-V - One weird noise

http://youtu.be/hZn8mCbW3Tg

Sound happened the way it did in the video, and also happened on a heel-toe downshift from 6th to 3rd on the highway and continued making that dumb noise... when revving while not on brakes, noise continued. Noise doesn't tie to RPM speed. Noise doesn't seem to tie to brakes either.

Anyone hear this wild noise? LOL

rear bushings

cradle? i doubt it'd be anything else. Sound seems to be from the front

rear bushings

That is what I think it is too...sounds like you rear differential bushing is going out. Sounds like the infamous driveline clunk to me.