Double height notification bar, tiny album art, huge wasted black void?

[Spankzz]

Yeah, so... 

Recently Spotify changed the notification bar significanlty on my device (Note 3). It's currently twice the normal height, with a small album art square in the top left, artist/album to the right, a yawning black abyss below and the play controls below that. 

It's wasting a huge amount of screen space on this huge black void - any ideas what's going on? REcently opted into the Sonos beta program so wondering if that's related. 

[dben89x]

Same thing here. I've also noticed the X button to close Spotify has also disappeared. On a Samsung Galaxy S6