Seems like the idea this year is an homage to Helvetica. Was it the documentary that did it? Also the notion is big bold buttons, no frills UI, which I think is a reaction to all the over-articulated function-rich applications online. Even the venerable Paul Isakson is right on board, and ya know, I think I may be next.
( It is worthwhile to note that the three examples above are squarely in the music genre.)