Perhaps the OP meant that we now have the history itself available, which up until now we've had to use 3rd party applications to access?I've always had the now playing feature, wasn't it a launch feature?
The "Now Playing" feature has been a component of my Pixel 2 XL from the time I purchased it in March; but unless I'm mistaken, the "Now Playing History" feature was not available on my device until yesterday, after we received the November update.