http://edition.cnn.com/2016/10/31/asia/japan-record-breaking-maglev-train/index.html
I think that maglev still has to be tested before starting passenger service.
It's true that the train can run at faster than 500km/h. But, it consumes three times as much electricity as conventional Shinkansen does.
So, we have to think whether or not it's OK to make travel time half by consuming three times electricity.