I think he refers mainly to the musical aspects of it, his guitar playing, etc.Yep, he also said that on a recent issue of the Prog magazine.
My anticipation would've been higher if he had said it's his best since Wish You Were Here anyway
If it will or can be as popular with the public I highly doubt. I've really liked what I've heard so far but considering DSOTM is one of the most popular, biggest selling albums of all time, that would be pretty hard to equal.