Didn't care much for the article, but the linked Nature Communications paper "Holographic acoustic elements for manipulation of levitated objects" is quite fun:

http://www.nature.com/ncomms/2015/151027/ncomms9661/full/nco...

Short 3 minute summary video from the supplementary materials, which has a fair amount of eye-candy: http://www.nature.com/ncomms/2015/151027/ncomms9661/extref/n...