This is not exactly a "new" version. It is more or less the arrangement they played from 2006-2009, only slowed down and simplified a little bit and without the electric slide solo parts that used to drive the song forward. It seems that Dylan has found out that none of his musicians is able to play this instrument and now they are all noodling between the verses. But the piano sounds great and it was the first time in 3 years that I really enjoyed a performance of this song. Nonetheless it gets a little tedious after some minutes because there is not much musical variation.
I would say, it's an attempt at singing these rockers in a manner where he doesn't have to bark the lyrics, as he has been doing for several years. He's slowing them down, and lowering the sound level of the instruments. It allows him to sing in a lower and clearer register. He's done the same thing with HW 61 and a few others. The upside, is less barking, leading to a clearer vocal. (It also allows him to showcase the grand piano a little more.) The downside, I would assume, to some, is that it takes a little bit of the steam out of the songs. I prefter the clearer vocal and slower arrangement.