I have also done it on my iPad Pro, as at the moment it isn’t a critical device, and I just had to test the new multitasking; which I really think they have done well on.
One little thing I will mention for people wanting it on their iPhones or daily critical devices, is that it seems not to work with AirPods... could just be my own personal hiccough, but no matter what I do, audio will not play through the AirPods. They connect and pair and everything fine, but no audio.
It’s also quite hard to find the audio output switcher, which you seemingly can only do by playing some music first so you get the music control up in the Music App, or long press the control centre widget where it then magically appears.
Would like to know if this is a widespread thing, or whether I just need to do a reinstall (I did the OTA).