It’s been a slow rollout here in the UK but now it’s here I had some inconsistencies. On my iPad Pro and iPhone it wasn’t showing as available in my country. On my iPad Mini it showed and I was able to subscribe.
Once subscribed I still couldn’t see it on my other devices.
To fix this I needed to delete the News app from my other devices and download again from the App Store. Once I had done this it worked fine for me across all devices.